ATI Radeon HD 2900 XT vs GeForce 6600 GT

Place in the ranking	1273	931
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	0.05
Power efficiency	no data	0.55
Architecture	Curie (2003−2013)	TeraScale (2005−2013)
GPU code name	NV43 A2	R600
Market segment	Desktop	Desktop
Release date	12 August 2004 (20 years ago)	14 May 2007 (17 years ago)
Launch price (MSRP)	$64.95	$399

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

no data

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores	no data	320
Core clock speed	500 MHz	743 MHz
Number of transistors	146 million	720 million
Manufacturing process technology	110 nm	80 nm
Power consumption (TDP)	no data	215 Watt
Texture fill rate	4.000	11.89
Floating-point processing power	no data	0.4755 TFLOPS
ROPs	4	16
TMUs	8	16

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Interface	PCIe 1.0 x16	PCIe 1.0 x16
Length	no data	241 mm
Width	1-slot	2-slot
Supplementary power connectors	None	1x 6-pin + 1x 8-pin

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory type	GDDR3	GDDR3
Maximum RAM amount	128 MB	512 MB
Memory bus width	128 Bit	512 Bit
Memory clock speed	500 MHz	828 MHz
Memory bandwidth	16 GB/s	106.0 GB/s

Connectivity and outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectors

1x DVI, 1x VGA, 1x S-Video

2x DVI, 1x S-Video

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	9.0c (9_3)	10.0 (10_0)
Shader Model	3.0	4.0
OpenGL	2.1	3.3
OpenCL	N/A	N/A
Vulkan	N/A	N/A

Synthetic benchmark performance

Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.

Combined synthetic benchmark score

This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

6600 GT 0.37

ATI HD 2900 XT 1.71
+362%

Passmark

This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.

6600 GT 142

ATI HD 2900 XT 659
+364%

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Pros & cons summary

Performance score	0.37	1.71
Recency	12 August 2004	14 May 2007
Maximum RAM amount	128 MB	512 MB
Chip lithography	110 nm	80 nm

ATI HD 2900 XT has a 362.2% higher aggregate performance score, an age advantage of 2 years, a 300% higher maximum VRAM amount, and a 37.5% more advanced lithography process.

The Radeon HD 2900 XT is our recommended choice as it beats the GeForce 6600 GT in performance tests.

Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.