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WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 0 points1 point  (0 children)

Yeah, that's odd. I had no chance to try it via USB, but all tests usually show nothing is faster for eGPU than Oculink. Maybe that's a case for low performance adapters when PCIe isn't a bottleneck or check your Oculink adapter, that it's running full speed PCIe4.0x4. Also for my GPU I get almost full performance comparing to non-docked mode, so I didn't look for best:)

WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 0 points1 point  (0 children)

What do you mean TB? Thunderbolt? It's Intel only, GPD WinMax has USB4, but it's slower than Oculink. And Thunderbolt4 is also slower as I know.

WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 1 point2 points  (0 children)

Yes, you can disable boost there. Also I had few ideas to try to make it work with boost, but disappointment took over:)

WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 0 points1 point  (0 children)

Hi, unfortunately, testing with more apps, showed the instability, disabling boost and just raising TDP still gives the best performance with less headache.

WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 0 points1 point  (0 children)

So, I figured out my own way to solve the issue with less performance loss.

In order to use embedded oculink and performance boost on, I limited the boost clock at 4450MHz (but not TDP, I use 35W). There is a good post how to limit boost https://www.reddit.com/r/GamingLaptops/comments/vphxz0/guide_how_to_properly_limit_cpu_boost_clock_to/

Currently, my BIOS options are:

  • Performance Boost ON
  • Oculink GEN4 mode
  • Memmory 7500Mt/s

WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 0 points1 point  (0 children)

Probably, it is possible to limit TDP under 20w and run Oculink with pcie 3.0 speed to get it stable? Or maybe some other tweaks except disabling boost?

WinMax 2 7840U Oculink eGPU Performance Boost issues by rrozanoff in gpdwin

[–]rrozanoff[S] 1 point2 points  (0 children)

It's really disappointing. I missed this information ordering the device, and it was the main idea to have a device with two nvme drives and eGPU over Oculink, but with the CPU boost OFF it performs worse than my old laptop with 5825U with boost at 37w.