Overclocking is what the EVGA Classified SR-2 is all about. Its sole reason for existence is to overclock a pair of the fastest CPU’s you can find, throw in a graphics card or four, and watch the benchmark records fall.
Our x5670 CPU’s start life out at 2.93GHz, but of course we wanted to see that magical 4GHz number. After getting our baseline numbers we headed back to the BIOS and dialed in a 182bclk, 1.3 vcore, and 1.35 of vtt. After a quick reboot we had reached 4GHz without breaking a sweat.
With Turbo enabled at this bclk we saw the CPU jumping up to 4370MHz under light CPU loads. Something else we noticed was that power consumption had jumped way up. With the system at idle we saw a low of 266W! When loading up just the CPU’s we saw a high of 435W. An extra GHz of CPU speed and some extra voltage quickly turns this system into a power hog!
I was not satisfied until I had 4.2GHz benchmarks across the board, so I upped the blck once again, this time to 191. After much tweaking, I found that 4.2GHz was stable at around 1.3625vcore. With 200MHz coming at a steep vcore increase, I decided that this pair of CPU’s probably isn’t the best pair of clockers and stopped there. With a custom water cooled setup I don’t see any problem running the system with these settings in a 24/7 environment. Just make sure your power supply is up to the task.