I tried disabling BD PROCHOT in ThrottleStop, and that resulted in a few instant shutdowns (when already warm or at a high load) and random reboots when in game.Īt this point I was using an UNPOWERED 4x to 16x adapter, so all the PCIe slot power was coming from the motherboard. Again, I thought thermal issues, but looking in HWInfo again, it seemed like the only throttling the GPU was doing was due to power, not temp. Okay, quick google search says that means SOME external signal or the CPU itself is telling the CPU to throttle. When in game or in benchmarks I was getting constant BD PROCHOT alerts and I noticed it was throttling when throwing that. I then installed ThrottleStop, since I was familiar with that from the laptop world, to see if I could force it to do what I wanted it to do. Initially I thought this was thermal throttling going on maybe due to limits set in the BIOS since this was such a tiny machine, but I was not seeing more than 50-55C on the GPU or CPU, and the CPU was only using 5-10W of its 35 TDP. For a few moments at a time, my CPU was at 950 Mhz when it should have been 3.4-3.6. First I went to HWInfo, and found that some throttling was going on. I was getting 25-40FPS in game when I was expecting 60 or so (Ghost Recon Breakpoint, most settings high 1080p). Once I finally got it running and playing games, I found performance was decent but not as good as I expected. The relay is triggered by 5v coming from the USB port on the PC. I am using a 5v opto-isolated mini relay to turn on the PSU by shorting the POWERON pin to GND. I am using the GPU power supply to also power a USB hub and RGB lights also mounted to the desk, both on 12v. The whole thing is mounted on the back spine of my desk and besides the wires you cannot tell there is a whole computer attached to the back of it. After having some issues with the grey ribbon style PCIe extenders, I bought some nicer looking black ones that had more rigid connections at the PCIe boards and so far so good with those. Adapter part number is above with link (check stock by calling first!). I found that this machine has an internal PCIe 4x slot that is a proprietary Lenovo conenctor, but with an adapter (from Lenovo) you can get a regular 4x slot out of it. This build took some time to plan and put together, but it is finally working and working well I am happy to report. Info on pushing the CPU a bit more with ThrottleStop settings is at the link below. The GPU scored a slightly higher 898 before I cranked the CPU fan. The best overall Novabench screenshot is here and that test was done with the CPU fan on full blast to pull a little more out of my CPU score. No time to play with that now but some tweaking will definitely be in order. I suspect this is either thermal or power related, I was originally thinking power, however digging on the Throttlestop forums I may be able to unlock a little more performance from there too. I am getting varying scores on the CPU when running Novabench tests, and I noticed it is showing a different clock speed during each test run. As you can see, performance was night and day. *** For reference, the two RivaTuner FPS screenshots during benchmarking were before and after I resolved the CPU power throttling issue. *** I used links for the pictures to not clog up the thread with high res images. I ended up having to order from ebay UK and have it sent to shipping forwarder to get my part to the US - Encompass LinkĢ65W 1U server power supply - Swapped two 40mm fans with Noctua Silent Series Lenovo 01AJ929 PCIe 4x adapter - Note: this was not in stock at this link and I waited two months to find that out. 2x PCIe 16x to 16x extension - I recommend these over the regular gray ribbons, I had issues with those and had to replace one - Linkġx PCIe 4x to 16x extension adapter (external power, which is important) - Link
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