Good day eGPU users!
I bougth the Lenovo Yoga c940 15 IRH recently. I thought I would give me a fine upgrade over the Lenovo Yoga 720 15 IKB I allready own. However:
The c940, when connected to my Razer Core X Chroma, offers about 12% less FPS than my Yoga 720 eventhough the c940 has a better CPU and a higher bandwith - if not for "device to device bandwith", which is about 5,2% lower with the c940 according to CUDAZ.
Yoga 720 Results:
- GPUZ+CUDAZ (see above)
- Red Dead Redemption 2 -> 57 FPS
- Spellforce 3 -> 53 FPS
- Shadow Warrior 2 -> 104 FPS
- The Witcher 3 -> 84 FPS
Yoga c940Results:
- GPUZ+CUDAZ (see above)
- Red Dead Redemption 2 -> 46 FPS
- Spellforce 3 -> 63 FPS
- Shadow Warrior 2 -> 94 FPS
- The Witcher 3 -> 78 FPS
Especially the really bad performance in Red Dead Redemption unnerves me...
Is there a chance to improve this result (tried different Drivers and diferent TB3 drivers) I`d be greatful for any hint.
Thx
phila
Did you disable the c940’s factory-set “Intelligent Cooling” mode?
Are you running the laptop in “Performance” mode?
@mini-i5, Thank you for your reply! Yes, I tried both of those options. I as well disabled the discrete GPU in bio as well just to check. All of this does not seem to influence performance.
I know that some games might behave differently on some systems - but I just do not get how the differenceon RDR 2 can be about 23% given that the 940 should have an advantage due to the processor (as one can see in Spellforce 3). This indicatest, that something is limiting the graphics bandwith...
Best regards
phila
P.S.: On Kingdome Come Deliverance however the performance seems to be as expected in this single case the c940 clearly beats the 720...
RDR performance varies a lot for everyone.
Here’s some game settings that might be helpful.
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
.@thom_and_the_wolves, i play at 2560:1080 with high-medium settings.
Best regards
phila
Can you download HWInfo64 and let me know your PCH temps? Curious if it's near the 80c mark
looks like you have no PCH cooling at all
@gareth_rees, hi there and thank you for borthing with my issue!!!
@itsage allready brought me to think about the PCH Temps some times ago ( https://egpu.io/forums/builds/2019-15-lenovo-yoga-c940-gtx1650-q-max-i7-9750h-6c-12t-rtx-2070-super-32gbps-tb3-razer-core-x-chroma-win-10-pro/) and they are in the upper 50°-lower 60° C`s so unfortunately this is not what hempers my Setup.
In fact the systems handles the heat far better than I thought. I did not watch the own or dissown video yet, but after a "cryonaut" repaste (first thin I do with a new machine) and and after undervolting core and cache to -129mV offset the temps of the CPU will hardly surpass 85°C during long gaming sessions with CPU intendive titles like AC:Odyssey while fully using CPU & dGPU. I could even OC the dGPU as it never gets above 65°C at al due to the Q-Max Desing/restrictions
The only time my machine gets really hot is when converting videos using AVX2 as the System by deflaut allows for a long term turbo boost of 65w (!!!) this isvery much for such a small machine (I manually allowed my former Aorus X7 dt V6 for not more than 60w lttb an this machine had a far bigger cooling system). So what I did is to reduce the lttb on my machine to 60w.
Long story short - unfortunately the issue seems to lie not in the temps but in the far more serious problem that the bios of 8th and 9th gen processors are not well optimized for TB3 as nandos observations suggest: https://egpu.io/forums/builds/2015-15-dell-precision-7510-q-m1000m-6th4ch-gtx-1080-ti-32gbps-m2-adt-link-r43sg-win10-1803-nando4-compared-to-tb3-performance/#post-72109 especially as my performance loss on GPU intensive titles seems to be in line with the loss he experienced.
I additionally can point out that all games using denuvo run absolutely horrible on eGPU...
Thank you once againg and all the best to you!
phila
@gareth_rees, hi there and thank you for borthing with my issue!!!
@itsage allready brought me to think about the PCH Temps some times ago ( https://egpu.io/forums/builds/2019-15-lenovo-yoga-c940-gtx1650-q-max-i7-9750h-6c-12t-rtx-2070-super-32gbps-tb3-razer-core-x-chroma-win-10-pro/) and they are in the upper 50°-lower 60° C`s so unfortunately this is not what hempers my Setup.
In fact the systems handles the heat far better than I thought. I did not watch the own or dissown video yet, but after a "cryonaut" repaste (first thin I do with a new machine) and and after undervolting core and cache to -129mV offset the temps of the CPU will hardly surpass 80°C during long gaming sessions with CPU intendive titles like AC:Odyssey while fully using CPU & dGPU. I could even OC the dGPU as it never gets above 65°C at al due to the Q-Max Desing/restrictions
The only time my machine gets really hot is when converting videos using AVX2 as the System by deflaut allows for a long term turbo boost of 65w (!!!) this isvery much for such a small machine (I manually allowed my former Aorus X7 dt V6 for not more than 60w lttb an this machine had a far bigger cooling system). So what I did is to reduce the lttb on my machine to 60w.
Long story short - unfortunately the issue seems to lie not in the temps but in the far more serious problem that the bios of 8th and 9th gen processors are not well optimized for TB3 as nandos observations suggest: https://egpu.io/forums/builds/2015-15-dell-precision-7510-q-m1000m-6th4ch-gtx-1080-ti-32gbps-m2-adt-link-r43sg-win10-1803-nando4-compared-to-tb3-performance/#post-72109 especially as my performance loss on GPU intensive titles seems to be in line with the loss he experienced.
I additionally can point out that all games using denuvo run absolutely horrible on eGPU...
Thank you once againg and all the best to you!
phila
Cryonaut is liquid metal/gallium right? Nice choice. Glad to see you got CPU temps sorted. I don't believe in the "BIOS" issue. I've had no issue with my eGPU. I've turned off anything that would use the PCH in the BIOS though, sans Wi-FI and Ethernet. I've also enabled TB3 bootup detection so it gets priority over anything else.
The fact that your PCH only reaches 50-60c means that it's being cooled by the chassis? 50-60c is what I get using copper shims + aluminum heatsink + active fan.
Can you let me know what you see in Power Options? I attached a picture. Setting to maximum savings lowers my idle temp to 30c if no GPU is connected, once it's connected I get maybe 51c idle and up to 60c at load.
