|EVGA GeForce GTX 580 Classified: Overclocked|
|Reviews - Featured Reviews: Video Cards|
|Written by Austin Downing|
|Thursday, 17 November 2011|
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The Microsoft DirectX-11 graphics API is native to the Microsoft Windows 7 Operating System, and will be the primary O/S for our test platform. DX11 is also available as a Microsoft Update for the Windows Vista O/S, so our test results apply to both versions of the Operating System. The majority of benchmark tests used in this article are comparative to DX11 performance, however some high-demand DX10 tests have also been included.
According to the Steam Hardware Survey published for the month ending May 2010, the most popular gaming resolution is 1280x1024 (17-19" standard LCD monitors). However, because this 1.31MP resolution is considered 'low' by most standards, our benchmark performance tests concentrate on higher-demand resolutions: 1.76MP 1680x1050 (22-24" widescreen LCD) and 2.30MP 1920x1200 (24-28" widescreen LCD monitors). These resolutions are more likely to be used by high-end graphics solutions, such as those tested in this article.
In each benchmark test there is one 'cache run' that is conducted, followed by five recorded test runs. Results are collected at each setting with the highest and lowest results discarded. The remaining three results are averaged, and displayed in the performance charts on the following pages.
In order to get the highest stable overclock, my preferred method is to slowly increase the core clock speed by 10MHz and make five runs through our Crysis 2 benchmark. This creates enough stress to quickly discern if the overclock is stable, and if so I continue increasing the overclock by another 10MHz until NVIDIA's Forceware driver's crash. From that point I fine tune my overclock to get the most stability out of the system.
After much deliberation I finally settled on 940MHz at 1.3v as the highest fully stable overclock that I could attain. Although this voltage is high for the speeds reached the Classified was designed to handle the higher voltages that are needed for record breaking speeds attained using extreme cooling solutions such as LN2 and Liquid Helium .
It should be noted that since no software will correctly advertise the voltage being used by the Classified I used a multimeter to attain the actual voltage of the Classified while overclocking.
Intel P67 Test System
DirectX-11 Benchmark Applications
Video Card Test Products
Disclaimer: Although we have pushed our card as far as we are able, your milage may vary based as each chip has its own characteristics.