GT200b: First review of 55nm GTX 260 emerged
Many rumors dealt with the new Nvidia GPU which is supposed to be called GT200b. Now the first review with benchmarks and pictures emerged.
The Geforce GTX 260 with Nvidia's new 55 nanometer GPU has a slightly smaller heat sink than the predecessor. It is shorter and the copper contact plate is more compact. In direct comparison to a GTX 260 with 65 nm technology the new card gets a little warmer. But with 80 degrees Celsius (workload) respectively 44 degrees Celsius (idle) the temperatures are only minimally higher than those of the old GTX 260 (77/43 degrees Celsius).
The clock core frequency and the number of Shader units didn't change compared to the 65 nanometer Geforce GTX 260-216. Thus the new GTX 260 has 216 Shader units and clock speeds of 576/1242/999 MHz (GPU/Shader ALUs/VRAM). The OC capabilities of the 55 nanometer chip seem to be quite good, too. The reviewers reached 720 MHZ GPU clock speed and the memory ran at 1130 MHZ.
Although the 55 nanometer architecture is supposed to reduce the power consumption the tests revealed that the new card needed 10 watts more than the GTX 260-216 when stressed. While the complete test system needed 312 watts with a Radeon HD 4870 only 275 watts were reached with the new Geforce GTX 260. This possibly is caused by the modified PCB layout. When idling the new 260 needs 5 watts less than the 65 nanometer version and the advantage to the Radeon HD 4870 increases to 35 watts.
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