|NVIDIA GeForce GTX 590 Gemini Video Card|
|Reviews - Featured Reviews: Video Cards|
|Written by Olin Coles|
|Thursday, 24 March 2011|
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NVIDIA Gemini Overclocking
As we've discussed in this article, NVIDIA's codename 'Gemini' project may use two GF110 GPUs from the GeForce GTX 580 series, but it wasn't designed to produce twice the performance. NVIDIA states that the GeForce GTX 590 should produce approximately 1.5x a single GTX 580 in most applications. That makes sense, considering the GTX 580's GF110 operates at 772 MHz and each of the GPUs in the GTX 590 run at only 608 MHz. That means that two GTX 580's in SLI combine for 1544 MHz to the GTX 590's 1216 MHz - a difference of 328 MHz, or 164 MHz on each GPU. That a lot of ground to cover with a single overclock.
Gemini uses a 12-later PCB For maximum signal integrity, so the overclocked GPUs could be more stable. To help disperse heat more effectively across the printed circuit board, two ounces of copper are used for each of the board's power and ground layers on the PCB. This also helps to enhance the circuit board's longevity. To help provide cooling for the PCB and its components, and aluminum baseplate is secured to the top of the board. In addition, two backplates are mounted on the bottom of the board to cool the graphics memory. NVIDIA also uses a 10-phase digital power controller with over-volting capability on Gemini. So let's see how far we were able to stretch the GPU's on Gemini...
AMD and NVIDIA already stretch their GPUs pretty thin in terms of overclocking head room, but there's a difference between thin and non-existent. In this section, Benchmark Reviews compares stock versus overclocked video card performance on the GeForce GTX 590 with default voltage supplied to the GPUs. Here are the test results:
GPU Overclocking Results
Overclocking Summary: With a 72 MHz overclock that represents a 11.8% increase in GPU speed, our baseline results indicate an average increase of about 5% in actual frame rate performance at 1920x1200 resolution. This usually amounted to an added 4+ FPS in most games. This isn't a huge performance boost, especially compared to single-GPU overclocks, but every extra frame translates into an advantage over your enemy. Of course, all of our results were gathered by using the standard core voltage. Once updated tools are available to better overclock these GPUs with added voltage, there will be additional headroom available for better performance.