Holy crap guys, I don't want to bash all of the hard work on Skyn3t's behalf but if youre on a reference PCB youre better off sticking with the default vbios that came on the card. I flashed to the Skyn3t's revised SC ACX.rom as I was having stability issues at 1241 core / 1851 memory (+100 / +200) in Max Payne 3 with 3D Vision at 1440p, the additional voltage DID allow me to remain stable at 1254 core but no higher. The temps weren't an issue with that game. As far as stability goes, 1241 core on the default vbios is mostly stable in all other demanding games, and I'm talking Crysis 3, Metro LL, AC4: Black Flag etc. But I've since reflashed to the default vbios as I'm waiting for my Kraken G10's to arrrive (to be used in conjunction with Corsair H55's and the existing ACX mid-plate to address VRM cooling) and not wanting to put undue wear on my GPU's until then. I've revisited a few benchmarks to see what kind of temp difference and WOW I am really surprised.
Firestrike with Skyn3t SC ACX vbios:
1254 core / 1850 memory (yes 1281 core is stable IN FIRESTRIKE with this vbios but the highest I can reliably attain in games at 1.212v is 1254 core)24,494 GPU
GPU0: 73 C
GPU1: 66 C
Temps by end of bench:
Default SC vbios:
1241 core / 1850 memory24,098 GPU
GPU0: 66C (-7C)
GPU1: 62C (-4C)
Temps by end of bench:
GPU0: 74C (-13C)
GPU1: 66C (-12C)
Things were getting so out of hand with the Skyn3t vbios (primary was hitting 85C in AC4: Black Flag at 1440p - 3D Vision, removing the side-panel brought that down to about 80 C) that I felt the need to dial back the temp target from 95 to 75C, and even "linking" the temp and power target until I realized that doing so would reduce the power target to 80% with a temp target of 75C. The temps were still outrageous with the temp target reduced. This vbios is GREAT if youre under water, but even then, without the ability to increase the voltage over 1.212v on cards with reference PCB's, what's the point? I gotta hand it to the engineers and programmers at Nvidia and EVGA, they truly optimized the default vbios', at least as far as the SC ACX variant is concerned. Undoing their expertise feels like a fools errand.
To be clear, these temps were in an Air 540, second only to a test-bench in terms of airflow, with aftermarket fan's pushing significantly more CFM AND an aggressive, and I mean aggressive fan algorithm on the ACX coolers (40% RPM at 30C increasing linearly to 100% at 65C):
I will probably stick with the default vbios when I get my G10's going, as it stands I'm still seeing 75C-78C primary in very demanding games.
An old adage comes to mind: "If it aint broke, don't fix it."Edit:
If youre interested in the G10 AIO cooling solution, "Faceman" in the following thread has the most comprehensive mini-guide out there:
Also check out the G10 forum here on OCN:
For $180 (what I paid for SLI, including everything "Faceman" recommends, G55's on sale for $50 shipped through Newegg on ebay and I already have 120mm fans for push-pull. Expect to pay about $100 per card) this is an excellent option for those with VRM cooling mid-plate cards such as Asus DCUII, EVGA ACX and MSI Lightning as testing has actually shown a 10-20C reduction
in VRM temps with the G10's 92mm fan blowing on these mid-plates, an improvement to be sure. Peak temps are typically 50-55C, down from 75-80C AND the heat is expelled from your case AND unlike GPU specific water-blocks, the G10 brackets are forward compatible with GTX 970, 980 and a host of AMD cards.