How much power does 55nm save?

As far as we know, the GTX+ is a simple die shrink of G92 so the only differences between it and the regular 9800 GTX are clock speeds and power consumption.

Luckily EVGA sent us one of their GeForce 9800 GTX KO cards, which happens to be clocked at virtually the same speed as the upcoming GTX+:

  9800 GTX+ EVGA 9800 GTX KO 9800 GTX
Core Clock 738MHz 738MHz 675MHz
Shader Clock 1836MHz 1836MHz 1690MHz
Memory Clock 1100MHz 1125MHz 1100MHz
Price Point $229 $209 - $239 $199

 

With the 9800 GTX KO you can get the performance of the GTX+ today, without waiting for July 16th for availability. What you do lose out on however is power. At idle the new 55nm chip draws about 3% less power than the overclocked 9800 GTX and actually draws 8.7% more power than the stock-clock 65nm 9800 GTX.

 

Under load, the GTX+ once again draws around 3% less power than EVGA's KO edition, it would seem that the move to 55nm actually doesn't buy NVIDIA much in the way of power savings.

The Test

We're keeping the commentary to a minimum here as this is a quick preview, we'll have a full performance analysis of the entire AMD and NVIDIA product lineups early tomorrow morning as the NDA lifts on AMD's Radeon HD 4870.

Test Setup
CPU Intel Core 2 Extreme QX9770 @ 3.20GHz
Motherboard EVGA nForce 790i SLI
Intel DX48BT2
Video Cards ATI Radeon HD 4850
ATI Radeon HD 3870 X2
ATI Radeon HD 3870
EVGA GeForce 9800 GTX KO
NVIDIA GeForce 9800 GTX+
NVIDIA GeForce 9800 GTX
NVIDIA GeForce 9800 GX2
NVIDIA GeForce 8800 GTX
NVIDIA GeForce 8800 GT
NVIDIA GeForce GTX 280
NVIDIA GeForce GTX 260
Video Drivers Catalyst Press Driver (8.7 beta)
Catalyst 8.5
ForceWare 177.34 (for GT200)
ForceWare 177.39 (for 9800 GTX+)
ForceWare 175.16 (everything else)
Hard Drive Seagate 7200.9 120GB 8MB 7200RPM
RAM 4 x 1GB Corsair DDR3-1333 7-7-7-20
Operating System Windows Vista Ultimate 64-bit SP1
PSU PC Power & Cooling Turbo Cool 1200W
Index Crysis & Call of Duty 4
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