Tech ARP - NVIDIA GeForce 8800 GTS 512MB Overclocking Guide

	Date :	30 December 2007
	Manufacturer :	N/A
	Source :	N/A
	Category :	Overclocking
	Author :	Dr. Adrian Wong
	Revision :	1.0
	Forum Link :	Discuss here !
	Views :	266403

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NVIDIA GeForce 8800 GTS 512MB Overclocking Guide

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How Well Did We Do?

After loads of tests, we finally pegged the maximum stable clock speeds of our GeForce 8800 GTS 512MB at 804 MHz core and 1080 MHz RAM. This means we managed to overclock the GPU by 154 MHz (23.7%). For those who are interested, overclocking the core to 804 MHz also overclocked the shader processors to 2010 MHz. We only managed to overclock the memory bus by 108 MHz (11.1%). Not a great overclock, but it was much higher than what we managed to accomplish with the GeForce 8800 GT.

Now, let's take a look at how the overclocked GeForce 8800 GTS 512MB compares to the stock GeForce 8800 GTS 512MB and a selection of other cards.

	GeForce 8800 GTX	GeForce 8800 GTS 512MB Overclocked	GeForce 8800 GTS 512MB	GeForce 8800 GT	GeForce 8600 GTS
Architecture	G80	G92	G92	G92	G84
Manufacturing Process	90 nm	65 nm	65 nm	65 nm	80 nm
Transistor Count	681 Million	754 Million	754 Million	754 Million	289 Million
DirectX Support	10	10	10	10	10
Interface	PCI Express	PCI Express 2.0	PCI Express 2.0	PCI Express 2.0	PCI Express
Stream Processors	128	128	128	112	32
Vertex Shader Version	4.0	4.0	4.0	4.0	4.0
Pixel Shader Version	4.0	4.0	4.0	4.0	4.0
ROPs	24	16	16	16	16
Core Speed	575 MHz	804 MHz	650 MHz	600 MHz	675 MHz
Fill Rate	36,800 MTexels/s	51,456 MTexels/s	41,600 MTexels/s	33,600 MTexels/s	10,800 MTexels/s
Memory Bus Width	384-bits	256-bits	256-bits	256-bits	128-bits
Memory Type	GDDR3	GDDR3	GDDR3	GDDR3	GDDR3
Memory Speed	900 MHz	1080 MHz	972 MHz	900 MHz	1000 MHz
Memory Bandwidth	86.4 GB/s	69.1 GB/s	62.2 GB/s	57.6 GB/s	32.0 GB/s

Even with the higher memory speed, the overclocked GeForce 8800 GTS 512MB still cannot match the memory bandwidth of the GeForce 8800 GTX. From specifications alone, the GeForce 8800 GTX has a 24.9% advantage in memory bandwidth. On the other hand, overclocking the GeForce 8800 GTS 512MB allowed it to increase its fillrate advantage over the GeForce 8800 GTX from 13% to 39.8%! So, is fillrate more important than memory bandwidth? Let's find out...

Testing The Overclocked GeForce 8800 GTS 512MB

Testbed

Processor	Intel Core 2 Extreme QX6700 - 2.67 GHz core clock - 8 MB L2 cache
Motherboard	ASUS P5N32-SLI Premium - NVIDIA nForce 590 SLI
Memory	Two G.Skill 1GB PC2-6400 DDR2 memory modules Two Kingston 512MB HyperX PC2-8500 DDR2 memory modules
Graphics Card	NVIDIA GeForce 8800 GTX ATI Radeon HD 2900 XT NVIDIA GeForce 8800 GTS 512MB NVIDIA GeForce 8800 GT NVIDIA GeForce 8600 GTS
Hard Drives	120GB Seagate Barracuda 7200.9 SATA hard drive 750GB Seagate Barracuda 7200.10 SATA hard drive
Operating System	Microsoft Windows Vista
Power Supply	Mushkin 580W PSU

The Graphics Cards

Graphics Card	Core Clock	Memory Clock	Memory Bus Width	Driver
NVIDIA GeForce 8800 GTX	575 MHz	900 MHz	384-bits	NVIDIA ForceWare 169.21
NVIDIA GeForce 8800 GTS 512MB Overclocked	804 MHz	1080 MHz	256-bits	NVIDIA ForceWare 169.21
NVIDIA GeForce 8800 GTS 512MB	650 MHz	972 MHz	256-bits	NVIDIA ForceWare 169.21
NVIDIA GeForce 8800 GT	600 MHz	900 MHz	256-bits	NVIDIA ForceWare 169.21
ATI Radeon HD 2900 XT	742 MHz	825 MHz	512-bits	ATI Catalyst 7.11
NVIDIA GeForce 8600 GTS	675 MHz	1000 MHz	128-bits	NVIDIA ForceWare 169.21

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