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NVIDIA GeForce 8600M GT Mobile GPU Review Rev. 2.0
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Introduction

The NVIDIA GeForce 8600M GT is the mobile version of the NVIDIA GeForce 8600 GT. It is based on the G84 GPU used by the GeForce 8600 GT. As such, it is similar to the GeForce 8600 GT desktop GPU in specifications.

Both are DirectX 10 GPUs with 32 stream processors and a 128-bit memory bus. They even have the same memory speed of 700 MHz and memory bandwidth of 22.4 GB/s.

The only difference is the core clock speed. The mobile GeForce 8600M GT runs at 475 MHz while the desktop GeForce 8600 GT is 13.7 % faster at 540 MHz.

To save money though, some manufacturers like Dell opt to use slower 400 MHz DDR2 memory, instead of the 700 MHz GDDR3 memory officially specified for the GeForce 8600M GT. This reduces its memory bandwidth by 43 %.

The lower-end NVIDIA GeForce 8600M GS, in comparison, is based on the smaller G86M GPU. Unlike the GeForce 8600M GT which has 32 stream processors and runs at a relatively low clock speed of 475 MHz, the GeForce 8600M GS only has 16 stream processors. So, while it runs at a higher clock speed of 600 MHz, it actually delivers a much lower performance than the "slower-running" GeForce 8600M GT.

Before we go into the tests, let's take a look at how the GeForce 8600M GT compares to its desktop counterpart, and a selection of desktop and mobile GPUs. For ease of comparison, we highlighted the mobile GPUs.

GeForce
8600 GT
GeForce
8600M GT
GeForce
8600M GT
(Dell)
GeForce
8600M GS
GeForce
7600 GT
GeForce Go
7600 GT
Architecture
G84
G84M
G84M
G84M
G73
G73M
Manufacturing Process
0.08 Micron
0.08 Micron
0.08 Micron
0.08 Micron
0.09 Micron
0.09 Micron
Transistor Count
289 Million
289 Million
289 Million
210 Million
177 Million
177 Million
DirectX Support
10
10
10
10
9.0c
9.0c
Interface
PCI Express
PCI Express
PCI Express
PCI Express
PCI Express
PCI Express
Stream Processors
32
32
32
16
-
-
Vertex Shaders
-
-
-
-
5
5
Vertex Shader Version
4.0
4.0
4.0
4.0
3.0
3.0
Pixel Shaders
-
-
-
-
12
12
Pixel Shader Version
4.0
4.0
4.0
4.0
3.0
3.0
ROPs
8
8
8
8
8
8
Core Speed
540 MHz
475 MHz
475 MHz
600 MHz
560 MHz
500 MHz
Fill Rate
8,640 MTexels/s
7,600 MTexels/s
7,600 MTexels/s
4,800 MTexels/s
6,720 MTexels/s
6,000 MTexels/s
Memory Bus Width
128-bits
128-bits
128-bits
128-bits
128-bits
128-bits
Memory Type
GDDR3
GDDR3
GDDR3
GDDR3
GDDR3
GDDR3
Memory Speed
700 MHz
700 MHz
400 MHz
700 MHz
700 MHz
600 MHz
Memory Bandwidth
22.40 GB/s
22.40 GB/s
12.80 GB/s
22.40 GB/s
22.40 GB/s
19.20 GB/s

The NVIDIA GeForce 8600M GT's specifications are impressive for a mobile GPU. It's more or less a desktop GPU that has been clocked down to reduce the thermal output. You may even be tempted to think it's right between the desktop GeForce 8600 GT and GeForce 7600 GT in performance. Well, that's what we intend to find out today when we compare the performance of the GeForce 8600M GT against a wide range of desktop graphics cards.

Do note that our Dell Inspiron 1520 notebook uses slower 400 MHz DDR2 SDRAM memory, instead of the 700 MHz clock speed officially specified for the GeForce 8600M GT. As such, it has a very low memory bandwidth. This will severely impact its performance at the higher resolutions and image quality settings.

 

Specifications

Here are the specifications of the NVIDIA GeForce 8600M GT mobile GPU.

Architecture

• G84M

Manufacturing Process

• 0.08 Micron

Transistor Count

• 289 Million

DirectX Support

• 10

Interface

• PCI Express X16

Stream Processors

• 32

Vertex Shader Version

• 4.0

Pixel Shader Version

• 4.0

Textures Per Clock

• 16

ROPs

• 8

Core Clock Speed

• 475 MHz

Shader Clock Speed

• 950 MHz

Fill Rate

• 7600 MTexels/s

Memory Bus Width

• 128-bits

Memory Size

• Up to 512 MB

Memory Type

• DDR2
• GDDR3

Memory Speed

• 400 GHz (800 MHz DDR) for DDR2 memory
• 700 GHz (1.4 GHz DDR) for GDDR3 memory

Memory Bandwidth

• 12.8 GB/s (DDR2)
• 22.4 GB/s (GDDR3)

Power Management

• PowerMizer 7.0

DVI Support

• Single dual-linked DVI, integrated into the GPU



<<< Overview : Previous Page   |   Next Page : Testing The GeForce 8600M GT >>>

 

 
   
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