sNullp Posted July 29, 2015 Share Posted July 29, 2015 I've done some research and found it is suggested that not letting the GPU exceed ~165W, which is calculated by 220W * 75% (DA-2 efficiency estimate). The post also mentioned down clocking and TDP throttling to avoid BSOD to confirms this theory.If this theory is true, it seems to me that only ZOTAC GTX 970 with stock configuration could fit the power requirement. However I found some inconsistency data points here:http://forum.techinferno.com/implementation-guides-apple/9821-2014-15-mbp-iris-gtx970%4016gbps-tb2-akitio-thunder2-win8-1-osx10-10-%5Bdschijn-2%5D.html (DA-2 can provide maybe 240W)http://forum.techinferno.com/implementation-guides-apple/10099-2012-15-macbook-pro-gtx970%4010gbps-tb1-akitio-thunder2-win7-osx10-10-3-%5Bbsohn%5D.html (200W + 12.5%)http://forum.techinferno.com/diy-e-gpu-projects/10124-gtx970-power-consumption-discussion-2.html (211W)http://forum.techinferno.com/enclosures-adapters/9426-220w-dell-da-2-ac-adapter-discussion-9.html (#89, ASUS GTX 970)So, I guess I'm slightly confused. If you also have a DA-2 + GTX970 configuration, could you post which brand you are using and are you down-clocking / throttle the maximum TDP to reach a stable behavior?Thanks! Quote Link to comment Share on other sites More sharing options...
Dschijn Posted July 29, 2015 Share Posted July 29, 2015 Running my Galaxy (KFA2) GTX 970 with 1455-80MHz and at the 110% power target stable with the DA-2.Be aware that the efficiency is better with higher voltages (230V in europe vs. 120V in the US). Quote Link to comment Share on other sites More sharing options...
sNullp Posted July 29, 2015 Author Share Posted July 29, 2015 Running my Galaxy (KFA2) GTX 970 with 1455-80MHz and at the 110% power target stable with the DA-2.Be aware that the efficiency is better with higher voltages (230V in europe vs. 120V in the US).Thank you, Dschijn! This makes sense to me that all data points suggesting DA-2 can drive a over-clocked GPU come from Europe. Waiting for more inputs here, though, to see which brand I should buy for my DA-2 + PE4C setup. Quote Link to comment Share on other sites More sharing options...
TheDeathEffect Posted July 30, 2015 Share Posted July 30, 2015 I can run my reference GTX 980 using a PE4C and Dell DA-2 PSU. It's stable at a +220 core overclock if the temp stays low enough. Quote Link to comment Share on other sites More sharing options...
bsohn Posted July 30, 2015 Share Posted July 30, 2015 I've done some research and found it is suggested that not letting the GPU exceed ~165W, which is calculated by 220W * 75% (DA-2 efficiency estimate). The post also mentioned down clocking and TDP throttling to avoid BSOD to confirms this theory.If this theory is true, it seems to me that only ZOTAC GTX 970 with stock configuration could fit the power requirement. However I found some inconsistency data points here:http://forum.techinferno.com/implementation-guides-apple/9821-2014-15-mbp-iris-gtx970%4016gbps-tb2-akitio-thunder2-win8-1-osx10-10-%5Bdschijn-2%5D.html (DA-2 can provide maybe 240W)http://forum.techinferno.com/implementation-guides-apple/10099-2012-15-macbook-pro-gtx970%4010gbps-tb1-akitio-thunder2-win7-osx10-10-3-%5Bbsohn%5D.html (200W + 12.5%)http://forum.techinferno.com/diy-e-gpu-projects/10124-gtx970-power-consumption-discussion-2.html (211W)http://forum.techinferno.com/enclosures-adapters/9426-220w-dell-da-2-ac-adapter-discussion-9.html (#89, ASUS GTX 970)So, I guess I'm slightly confused. If you also have a DA-2 + GTX970 configuration, could you post which brand you are using and are you down-clocking / throttle the maximum TDP to reach a stable behavior?Thanks!You listed my build in your post and it has been completely stable at the Stock (Factory Overclock) Galax GTX970 settings with the DA-2 in the US. Brion Quote Link to comment Share on other sites More sharing options...
Dschijn Posted July 30, 2015 Share Posted July 30, 2015 I can run my reference GTX 980 using a PE4C and Dell DA-2 PSU. It's stable at a +220 core overclock if the temp stays low enough. That is awesome! Guess the power limit isn't that high and close to the OC GTX 970 cards. Quote Link to comment Share on other sites More sharing options...
newmagneto Posted August 4, 2015 Share Posted August 4, 2015 I can run my reference GTX 980 using a PE4C and Dell DA-2 PSU. It's stable at a +220 core overclock if the temp stays low enough.That's great, but i have problem is sometime play game eGPU auto disconnect and enable after seconds. I have no idea what is that, is that my Dell DA-2 have problem??? Quote Link to comment Share on other sites More sharing options...
TheDeathEffect Posted August 5, 2015 Share Posted August 5, 2015 That's great, but i have problem is sometime play game eGPU auto disconnect and enable after seconds. I have no idea what is that, is that my Dell DA-2 have problem???Sounds like it might be a signal instability problem. What adapter are you using? Try setting the link speed to gen 1 and see if that solves the problem. If you connect a high wattage ATX PSU and the problem goes away, then chances are it's your Dell DA-2 that's the problem. Quote Link to comment Share on other sites More sharing options...
newmagneto Posted August 5, 2015 Share Posted August 5, 2015 Sounds like it might be a signal instability problem. What adapter are you using? Try setting the link speed to gen 1 and see if that solves the problem. If you connect a high wattage ATX PSU and the problem goes away, then chances are it's your Dell DA-2 that's the problem.Sound great, i use exp gdc beast and mPCIE, just few months ago, i have played without issue, maybe gtx 970 have more than 220W?? Quote Link to comment Share on other sites More sharing options...
TheDeathEffect Posted August 5, 2015 Share Posted August 5, 2015 Sound great, i use exp gdc beast and mPCIE, just few months ago, i have played without issue, maybe gtx 970 have more than 220W??A lot of people have reported success with a GTX 970 and Dell DA-2. if you swap to an ATX PSU and it gives you stable performance, then it's probably your culprit. 1 Quote Link to comment Share on other sites More sharing options...
Tech Inferno Fan Posted August 7, 2015 Share Posted August 7, 2015 @sNullp , consider adding capacitors to improve stability like explained at http://forum.techinferno.com/enclosures-adapters/10150-fixing-instability-akitio-thunder2-w-gtx970-when-using-dell-da-2-a.html#post135250 Quote Link to comment Share on other sites More sharing options...
sNullp Posted August 10, 2015 Author Share Posted August 10, 2015 @sNullp , consider adding capacitors to improve stability like explained at http://forum.techinferno.com/enclosures-adapters/10150-fixing-instability-akitio-thunder2-w-gtx970-when-using-dell-da-2-a.html#post135250Currently I experienced no problem even if I OCed 150mhz off the GPU. So I'm not considering this hacking at this step. I'm more eager to solve the laptop blank boot screen problem if DA-2 is connected to the PE4c. See my comments in the PE4C thread. Quote Link to comment Share on other sites More sharing options...
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