- Joined
- May 11, 2003
What started out as a plan to install a small custom loop to replace my Corsair H110i GT turned into a much bigger project when I decided to incorporate my EVGA 980 Ti Hybrids into the loop as well. I switched from an Asus x99 Deluxe to an Asus Rampage V Extreme, both of which are the USB 3.1 variant. Aside from a motherboard, power supply, case and cooling upgrade, everything else is the same. All said and done, it turned out fantastic with the exception of performance in SLI.
When I test/bench the 980 Ti's individually, they perform notably better than they did with the old Hybrid coolers and run much cooler. When I test/bench them in SLI they don't come close to what I achieved in SLI with the stock EVGA Hybrid coolers. There seems to be a bottleneck somewhere as the cards in SLI are holding their overclock nicely, but I get the same scores at stock speeds and overclocked. When I run tests with the cards configured individually, an overclock results in a substantial improvement. This behavior happens with or without a CPU overclock as well.
I've pulled the cards and reseated them to no avail. I tried 3 different SLI bridges along with testing old and new drivers with no impact. Both cards are installed the recommended x16 slots.
At this point, the only thing I can think of is that it's either a motherboard issue or something with the 980 Ti's changed when I replaced the stock hybrid coolers with EK water blocks.
I'd appreciate any advice with troubleshooting!
Asus RAMPAGE V EXTREME/U3.1
i7 5960x
32 GB Corsair Vengeance LPX
2 x EVGA 980 Ti Hybrid
512 GB Samsung 950 Pro
Corsair AX1500i
Custom water loop with EK blocks for CPU/GPU
When I test/bench the 980 Ti's individually, they perform notably better than they did with the old Hybrid coolers and run much cooler. When I test/bench them in SLI they don't come close to what I achieved in SLI with the stock EVGA Hybrid coolers. There seems to be a bottleneck somewhere as the cards in SLI are holding their overclock nicely, but I get the same scores at stock speeds and overclocked. When I run tests with the cards configured individually, an overclock results in a substantial improvement. This behavior happens with or without a CPU overclock as well.
I've pulled the cards and reseated them to no avail. I tried 3 different SLI bridges along with testing old and new drivers with no impact. Both cards are installed the recommended x16 slots.
At this point, the only thing I can think of is that it's either a motherboard issue or something with the 980 Ti's changed when I replaced the stock hybrid coolers with EK water blocks.
I'd appreciate any advice with troubleshooting!
Asus RAMPAGE V EXTREME/U3.1
i7 5960x
32 GB Corsair Vengeance LPX
2 x EVGA 980 Ti Hybrid
512 GB Samsung 950 Pro
Corsair AX1500i
Custom water loop with EK blocks for CPU/GPU