Visual Processing Unit

GeForce
7900GS


Interface

PCI
Express x16

Memory

256MB,
GDDR3

Rendering
Operation Output Units

16
ROP units


Pixel Shader Processor Units

20
Pixel Shader Processor units


Vertex Shaders

7
Vertex units


Memory Interface

256-Bit


Core Clock

450
MHz


Memory Clock

660/1320
MHz


RAMDAC

400MHz


Max Resolution

2560×1600


Rear I/O Ports

2x
DVI, 1x S-Video / TV-Out

Specification/Model
GeForce 7900GTX

GeForce

7900GT
GeForce

7900GS

GeForce

7600GT

X1900GT

X1800XL
Pixel
Pipelines

24

24
20
12
1216
Pixel
Shader Processors

24

24
20
12
3616
Vertex
Shaders
88
7588
ROPs1616
1681216
Core
Clock

650MHz
450MHz
450MHz
560MHz
575MHz

500MHz
Memory
Clock (DDR)

800MHz (256bit) GDDR3

660MHz (256bit) GDDR3

660MHz

(256bit) GDDR3

700MHz (128bit) GDDR3
800MHz
(256bit) GDDR3
500MHz
(256bit) GDDR3

10 NVIDIA 7900GS Review

And so it was time to set up the test platform and do some
performance tests. I compared it against 5 other Video Cards, NVIDIA reference
7600GT, 7900GT, 7900GTX, PowerColor ATi X1900GT and HIS X1800GTO flashed
to X1800XL.
The closest direct ATi competitor of this card seems to
be the X1800GTO but searching through online stores showed me that I could get
a X1800XL for around the same price as the 7900GS.

Platform
Test Setup

CPU

Intel
Core 2 Duo E6600 2.4GHz

Motherboard

Gigabyte
965P DS3

Memory

2
x 512MB Corsair 5400UL DDR2 Memory set at CL4-4-4-5 DDR2 800

Graphics
Card

NVIDIA
7900GS 256MB
NVIDIA
7900GT 256MB
NVIDIA
7900GTX 512MB

NVIDIA
7600GT 128MB

ATi
X1900GT 256MB
ATi
X1800XL 256MB

Drivers

NVIDIA
Forceware 91.47, ATi Catalyst 6.8

Power
Supply

Silverstone
Zeus ST56ZF

Optical
Storage

ASUS
16x DVD Rom

Hard
Disk

Seagate
80GB Barracuda SATA

Operating
System

Windows
XP Professional SP2

16 NVIDIA 7900GS Review

I picked a setup leaning more towards the high-end, but not
exactly top of the range. People buying this card would probably be
running a setup close to this, or slighly slower.
Tests were performed
with and without 16x Anisotropic Filtering: A very necessary visual enhancement
that adds details to your textures.

Tests ran on the NVIDIA Cards were left at default settings
except when AF was used, and that was set at 16xAF:

8 NVIDIA 7900GS Review

To pit the ATi cards on a fairer ground, settings were left
at default as well except the MipMap Detail, which was tuned down one notch
to Quality settings to match the image quality setting with the NVIDIA Cards.

2 NVIDIA 7900GS Review

When AF tests were ran, High Quality AF was selected as this
would match the AF setting on the NVIDIA Cards visibly.

3 NVIDIA 7900GS Review