Table of Contents
- Quick Answer
- What a 4K 240Hz OLED Signal Requires
- 4K 240Hz vs 1440p 360Hz: Do Not Treat Them as the Same Requirement
- Single-Monitor and Dual-Monitor Limits
- TESmart Compatibility Matrix: Published Limits vs Validation Required
- DisplayPort 1.4 vs HDMI 2.1 for OLED Gaming
- TESmart DKS202-M24 vs HKS202-M24
- How to Validate an OLED Monitor Before Relying on 4K 240Hz
- When an External KVM Is Not the Best Choice
- Troubleshooting Black Screens, 60Hz Fallbacks, and Wake Problems
- Related TESmart Guides
- FAQ
- Conclusion
Quick Answer
Yes, a KVM can carry a 4K 240Hz OLED signal, but the specification must be read carefully. TESmart currently lists 3840×2160 at 240Hz with DSC in the supported-resolution tables for both the DisplayPort-based DKS202-M24 and the HDMI 2.1-based HKS202-M24. Their dual-monitor positioning, however, is dual 4K 144Hz. That means buyers should not assume that a published 4K 240Hz per-output ceiling also guarantees two simultaneous 4K 240Hz displays.
Neither model currently lists 2560×1440 at 360Hz in its published specifications. For 1440p 360Hz, a direct video connection combined with a separate USB switch may be the safer design unless the exact KVM, monitor, GPU, firmware, and cable combination has been validated.
The question is not simply whether the OLED panel supports 240Hz. The full path must support the same display mode: GPU or laptop output, DSC behavior, KVM input and output, both video cables, monitor input, color depth, HDR, VRR, driver, firmware, and operating-system settings.
What a 4K 240Hz OLED Signal Requires
A 4K 240Hz OLED monitor places a much heavier load on the display link than a 4K 60Hz office monitor. Increasing resolution, refresh rate, color depth, and chroma quality all increase the data that must cross the link. HDR and adaptive sync add further negotiation requirements.
Many current 4K 240Hz workflows rely on Display Stream Compression support from the GPU and the rest of the display chain. VESA describes DSC as a low-latency, visually lossless compression method used to carry demanding display modes within the available link bandwidth. A connector labeled DisplayPort 1.4 or HDMI 2.1 does not, by itself, prove that every device in the path supports the required DSC mode.
- The source port must support the target mode. Check the exact GPU output or laptop port, not only the GPU family name.
- The monitor input must expose 4K 240Hz through that port. Some monitors use different limits on DisplayPort and HDMI.
- The KVM must list the required resolution and refresh rate. A generic “8K” label is not enough.
- Both cables must support the same link. A KVM creates two cable segments: source to KVM and KVM to monitor.
- DSC, HDR, VRR, bit depth, and chroma must negotiate together. A setup that reaches 4K 240Hz in SDR 8-bit mode may behave differently with HDR and 10-bit color enabled.
VRR also needs end-to-end support. HDMI explains that Variable Refresh Rate lets the source deliver frames at a changing rate to reduce tearing and judder. NVIDIA and AMD apply their own G-SYNC Compatible and FreeSync requirements on top of the physical link. After installing a KVM, confirm the active VRR state in the monitor OSD and GPU control panel rather than assuming it remained enabled.
4K 240Hz vs 1440p 360Hz: Do Not Treat Them as the Same Requirement
4K 240Hz and 2560×1440 360Hz are both high-refresh modes, but support for one does not imply support for the other. The timing, bandwidth, DSC behavior, monitor firmware, and EDID entries can be different.
| Display Mode | What Makes It Difficult | What the Current TESmart Product Pages List | Buying Interpretation |
|---|---|---|---|
| 3840×2160 at 240Hz | Very high pixel rate; commonly depends on DSC and exact color settings | Listed for DKS202-M24 and HKS202-M24 with DSC | Possible as a published per-output mode, but validate the exact OLED, GPU, cables, HDR, and VRR combination |
| 2560×1440 at 240Hz | Lower resolution but still requires a stable high-refresh link | Listed for both models | A more clearly documented target than 1440p 360Hz |
| 2560×1440 at 360Hz | Extremely high refresh timing; may require a different EDID mode or link behavior | Not listed for either model | Do not purchase on the assumption that “240Hz/8K support” includes 360Hz |
| 4K 240Hz + HDR + VRR | Resolution, DSC, color depth, HDR metadata, and adaptive sync must work at the same time | The pages list 4K 240Hz DSC and relevant HDR/VRR features, but not a universal monitor-by-monitor validation table | Test the exact combination; do not treat separate feature listings as proof of simultaneous compatibility in every setup |
This distinction matters for OLED buyers because product search results often mix 4K 240Hz monitors with QHD 360Hz monitors. A KVM recommendation should follow the exact mode in the monitor manual, not a general “high refresh rate” category.
Single-Monitor and Dual-Monitor Limits
The most important specification distinction is the difference between a per-output maximum and a dual-monitor operating target.
The DKS202-M24 product page states that each DisplayPort output supports modes including 4K 240Hz with DSC. The same page positions the model for dual 4K 144Hz gaming. The HKS202-M24 supported-resolution table also lists 4K 240Hz with DSC, while the product is positioned as an HDMI 2.1 dual 4K 144Hz KVM.
Practical reading: use 4K 240Hz as the published ceiling for an individual output. Use dual 4K 144Hz as the published dual-monitor design target. Do not assume dual 4K 240Hz unless TESmart has validated that exact configuration for the specific hardware and firmware involved.
A dual-monitor KVM also does not create two independent extended displays from one ordinary video connection. Each computer normally needs two video outputs connected to the KVM—one signal path for each monitor. A laptop with only one usable external display output cannot gain a second native display merely because the KVM has two monitor outputs.
- Two computers and two monitors usually require four source-side video cables.
- Each computer must support two external display signals at the requested modes.
- A dock or USB-C adapter may add outputs, but it also adds another compatibility layer.
- macOS display limits, dock architecture, and adapter behavior must be checked separately.
TESmart Compatibility Matrix: Published Limits vs Validation Required
The following matrix separates published specifications from combinations that still need setup-specific testing. It reflects the TESmart product pages checked on July 7, 2026; firmware and product-page specifications may change.
| Use Mode | DKS202-M24 | HKS202-M24 | What Still Needs Confirmation |
|---|---|---|---|
| Single OLED monitor at 4K 240Hz | 4K 240Hz with DSC is listed per DisplayPort output | 4K 240Hz with DSC is listed in the supported-resolution table | GPU output, monitor input, DSC, cable rating, color depth, HDR, VRR, firmware, and driver |
| Two monitors at 4K 144Hz | Published dual-monitor gaming target | Published dual-monitor product positioning | Both computers need two capable outputs; validate mixed-monitor timing and cable quality |
| Two monitors at 4K 240Hz | Not published as a dual 4K 240Hz operating mode | Not published as a dual 4K 240Hz operating mode | Do not assume support from the per-output 4K 240Hz listing |
| 1440p 240Hz | Listed | Listed | VRR range, HDR, color format, and monitor input mode |
| 1440p 360Hz | Not listed | Not listed | Use direct video or obtain exact model-specific validation before relying on a KVM |
| 4K 240Hz with HDR and VRR enabled together | Requires exact-chain validation | Requires exact-chain validation | Monitor model, GPU, firmware, bit depth, DSC, VRR protocol, and both cables |
This is the level of detail buyers need when comparing a 4K 240Hz KVM. A maximum-resolution row answers only part of the question; monitor count and simultaneous feature combinations decide whether the setup will behave as expected.
DisplayPort 1.4 vs HDMI 2.1 for OLED Gaming
The better interface is usually the one that matches the strongest native input on the OLED monitor and the strongest native outputs on both computers. Converting everything to a different connector can add adapters, reduce available modes, and make sleep/wake behavior less predictable.
| Decision Point | DisplayPort 1.4 KVM Path | HDMI 2.1 KVM Path |
|---|---|---|
| Typical source | Gaming PC, workstation GPU, creator desktop | Gaming PC, console, HDMI-first laptop or dock |
| Typical display | PC gaming OLED monitor whose preferred high-refresh input is DisplayPort | OLED monitor or OLED TV whose preferred gaming input is HDMI 2.1 |
| High-refresh behavior | 4K 240Hz often depends on DisplayPort 1.4 plus DSC | High-refresh modes depend on the monitor’s HDMI implementation, cable, DSC use where applicable, and source capability |
| Adaptive sync | Common in PC-focused G-SYNC Compatible and FreeSync workflows | Common in HDMI VRR, FreeSync, console, and TV workflows |
| Laptop and Mac consideration | Many laptops and most Macs do not have native full-size DisplayPort, so USB-C-to-DP conversion may be required | Often simpler when the laptop or dock provides a proven HDMI output at the target mode |
| Main risk | An adapter or dock may not preserve DSC, HDR, VRR, or wake behavior | An HDMI port labeled “2.1” may still expose different bandwidth or gaming features depending on the device |
For a deeper interface comparison, see TESmart’s guides to choosing an HDMI 2.1 KVM for gaming and DisplayPort 2.1 monitor compatibility with current KVM workflows.
TESmart DKS202-M24 vs HKS202-M24
Choose DKS202-M24 for a DisplayPort-First OLED Desk
TESmart DKS202-M24 is more suitable when two computers and two monitors are built around native DisplayPort connections. It provides four DP 1.4 inputs for the two computers, two DP 1.4 monitor outputs, EDID emulation, USB peripheral sharing, VRR support, and multiple switching methods.
This model makes more sense for:
- a gaming PC and Windows workstation with native DisplayPort outputs;
- two DisplayPort OLED or high-refresh monitors;
- a PC-first desk where G-SYNC Compatible or FreeSync behavior is important;
- a mixed gaming and productivity setup targeting dual 4K 144Hz;
- a laptop that has already been validated through a USB-C-to-DisplayPort path.
It is less suitable when both computers depend on HDMI, when a MacBook requires several conversion layers, or when the target is a DP 2.1 UHBR20 mode that cannot be reproduced through a DP 1.4 DSC path.
Choose HKS202-M24 for an HDMI 2.1-First OLED Desk
TESmart HKS202-M24 is more suitable when the OLED monitor, OLED TV, console, gaming PC, or laptop dock is built around HDMI. It provides four HDMI 2.1 inputs, two HDMI 2.1 monitor outputs, EDID emulation, VRR, USB peripheral sharing, and HDMI-focused gaming features such as ALLM and Dynamic HDR positioning.
This model makes more sense for:
- an HDMI 2.1 OLED monitor or OLED TV used by two computers;
- a PC and console desk where the display’s best shared input path is HDMI;
- two HDMI monitors targeting dual 4K 144Hz;
- a work laptop or dock with a proven HDMI output;
- users who want to avoid USB-C-to-DisplayPort conversion.
It does not make every HDMI source equivalent. A console, desktop GPU, and laptop dock may expose different HDR, VRR, color, and refresh-rate options even when they use the same connector.
| Question | DKS202-M24 | HKS202-M24 |
|---|---|---|
| Primary video interface | DisplayPort 1.4 | HDMI 2.1 |
| Best match | PC GPU and DisplayPort monitor workflows | HDMI monitor, OLED TV, console, and HDMI dock workflows |
| Published 4K 240Hz entry | Yes, with DSC per output | Yes, with DSC in the supported-resolution table |
| Published dual-monitor positioning | Dual 4K 144Hz | Dual 4K 144Hz |
| 1440p 360Hz listed | No | No |
| EDID emulation | Yes | Yes |
How to Validate an OLED Monitor Before Relying on 4K 240Hz
A useful compatibility test should record the exact hardware and settings. “It works at 4K 240Hz” is incomplete unless the test also identifies HDR, VRR, bit depth, monitor count, firmware, driver, cables, and sleep/wake behavior.
- Test the monitor directly from the GPU. Confirm the target mode before adding the KVM.
- Record the exact source port. A GPU may expose different capabilities over DisplayPort and HDMI.
- Check whether the monitor requires DSC. Review the monitor manual and OSD setting.
- Use two short, correctly rated cables. Replace one cable at a time if the mode disappears through the KVM.
- Add the KVM and select the same mode. Confirm resolution and refresh rate in Windows Advanced Display or the equivalent operating-system panel.
- Confirm the active signal in the monitor OSD. Do not rely only on a Windows dropdown.
- Enable HDR and verify the color format. Record bit depth and chroma if the GPU control panel exposes them.
- Enable VRR. Check the NVIDIA or AMD control panel and the monitor OSD.
- Switch away and back several times. Record black-screen time, resolution fallback, and whether VRR remains active.
- Test sleep and wake. Repeat with both computers because laptop and desktop behavior can differ.
Recommended test record: OLED monitor model and firmware, GPU model, GPU driver, operating system, KVM model and firmware, cable models and lengths, monitor count, resolution, refresh rate, DSC state, HDR state, VRR state, color depth, switching behavior, and wake result.
Until a specific monitor-and-GPU combination has been tested this way, the accurate claim is “supported by the published resolution table, subject to full-chain compatibility,” not “guaranteed for every 4K 240Hz OLED setup.”
When an External KVM Is Not the Best Choice
An external KVM is useful when video and USB control must move together, but it is not always the most reliable path for the highest mode a monitor can produce.
- Your target is 1440p 360Hz or another unlisted mode. Keep video connected directly to the GPU and use a USB switch for keyboard, mouse, and peripherals.
- Your OLED monitor already has a capable built-in KVM. The monitor can switch video inputs while its USB upstream connection changes between computers. Compare the limitations in TESmart’s guide to a monitor with a built-in KVM versus an external KVM switch.
- You need only video switching. A video switch may be simpler if keyboard, mouse, and USB devices do not need to follow the display.
- One computer cannot output the target mode. A KVM cannot upgrade a laptop port, dock, GPU, or operating-system display limit.
- Your workflow depends on uncompressed DP 2.1 UHBR20. A DP 1.4 DSC KVM can be practical for many 4K high-refresh modes, but it is not a substitute for every full-bandwidth DP 2.1 path.
A split design—direct video plus a USB switch—uses more controls, but it can preserve an extreme monitor mode that is not documented through the KVM.
Troubleshooting Black Screens, 60Hz Fallbacks, and Wake Problems
High-refresh OLED problems usually come from link negotiation, EDID, cables, adapters, or an unsupported combination rather than the OLED panel itself.
| Symptom | Likely Cause | First Checks |
|---|---|---|
| Monitor falls back to 60Hz | Unsupported timing, cable limit, DSC not active, EDID fallback, adapter or dock limitation | Test direct connection, confirm DSC, reduce color depth temporarily, replace cables, check the monitor OSD |
| Black screen after switching | New source cannot negotiate the selected mode, monitor input mode mismatch, weak cable, driver or firmware issue | Start at 4K 60Hz, then raise refresh rate step by step; remove adapters and update firmware |
| Windows rearranges applications | The operating system detects a display disconnect or different EDID | Confirm EDID emulation is active and use the same monitor input and resolution for both computers |
| HDR or VRR disappears | The negotiated mode changed after switching, or the new source uses different color/VRR settings | Recheck GPU control panel, Windows display settings, monitor OSD, and cable path |
| Wake from sleep fails | Laptop output, monitor deep-sleep mode, dock, adapter, USB resume, or display handshake timing | Disable monitor deep sleep for testing, bypass the dock, wake the computer before switching, and update drivers |
For detailed procedures, see why a KVM switch may fall back to 60Hz and how EDID emulation helps with black screens, window movement, and monitor redetection.
Related TESmart Guides
- How Do I Know If My Graphics Card Supports DSC?
- Why Your KVM Switch Only Shows 60Hz?
- EDID Emulation Explained: How It Makes KVM Multi-Monitor Switching More Stable
- DisplayPort 2.1 Monitors and KVM Switches: UHBR, DP80, DSC, and Real-World Compatibility
- A Guide to Selecting HDMI 2.1 KVM Switches for Gaming
- Monitor With Built-in KVM vs External KVM Switch
Technical References
- VESA Display Compression Codecs
- HDMI Variable Refresh Rate
- NVIDIA G-SYNC Monitor Specifications
- AMD FreeSync Technology
FAQ
Can a KVM really support a 4K 240Hz OLED monitor?
Yes, when the exact KVM output, GPU or laptop port, monitor input, DSC mode, both cables, driver, firmware, and display settings support the same timing. DKS202-M24 and HKS202-M24 currently list 4K 240Hz with DSC, but that does not guarantee every HDR, VRR, color-depth, and monitor combination.
Can these KVMs run two 4K 240Hz OLED monitors at the same time?
Do not assume so. The published product positioning is dual 4K 144Hz, while 4K 240Hz appears as a supported per-output or resolution-table mode. Dual 4K 240Hz is not published as the standard dual-monitor operating target.
Do DKS202-M24 or HKS202-M24 support 1440p 360Hz?
Neither product page currently lists 2560×1440 at 360Hz. Both list 2560×1440 at 240Hz. For a 360Hz OLED monitor, use a direct video path or obtain exact model-specific validation before buying around that requirement.
Is DSC required for 4K 240Hz?
Many 4K 240Hz workflows use DSC, especially over DisplayPort 1.4. The exact requirement depends on the interface, color depth, chroma format, HDR mode, monitor design, and GPU output. Check the monitor’s resolution table and the exact source-port specification.
Will HDR and VRR work at 4K 240Hz through a KVM?
They may, but the exact combination must be validated. A product page can list 4K 240Hz, HDR, and VRR as separate capabilities without proving that every monitor and GPU can use all three simultaneously through every cable and firmware version.
Should I choose DisplayPort 1.4 or HDMI 2.1 for an OLED gaming monitor?
Follow the monitor’s strongest input and the source devices’ native outputs. Choose DKS202-M24 for a DisplayPort-first PC desk. Choose HKS202-M24 for an HDMI-first monitor, OLED TV, console, or laptop-dock desk. Avoid unnecessary conversion wherever possible.
Can a MacBook use a DisplayPort KVM for an OLED monitor?
Yes, but most MacBooks do not provide a native full-size DisplayPort connector. The Mac side normally needs a USB-C-to-DisplayPort cable or a compatible dock. Confirm the Mac model’s external-display limit and test the adapter path at the target resolution, refresh rate, HDR setting, and wake behavior.
Conclusion
A KVM can be part of a 4K 240Hz OLED setup, but the buying decision should be based on the exact display mode rather than the words “8K,” “240Hz,” or “HDMI 2.1” in isolation.
DKS202-M24 is the more suitable TESmart option for a DisplayPort-first dual-monitor PC workstation. HKS202-M24 is the more suitable option for an HDMI 2.1-first OLED, TV, console, or mixed entertainment desk.
For both models, read 4K 240Hz as a published high-end output mode and dual 4K 144Hz as the published dual-monitor target. Treat 1440p 360Hz, dual 4K 240Hz, and 4K 240Hz with HDR and VRR enabled together as configurations that require explicit validation—not assumptions.
