Radeon HD 6990 vs Radeon HD 2900 XT
We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 512MB VRAM Radeon HD 2900 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon HD 6990 's Advantages
Released 3 years and 10 months late
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (160.0GB/s vs 106.0GB/s)
1216 additional rendering cores
Radeon HD 2900 XT 's Advantages
Lower TDP (215W vs 375W)
Score
Benchmark
FP32 (float)
Radeon HD 6990
+435%
2550
Radeon HD 2900 XT
476
Graphics Card
Mar 2011
Release Date
May 2007
Northern Islands
Generation
Radeon R600
Desktop
Type
Desktop
PCIe 2.0 x16
Bus Interface
PCIe 1.0 x16
Clock Speeds
1250 MHz
Memory Clock
828 MHz
Memory
2GB
Memory Size
512MB
GDDR5
Memory Type
GDDR3
256bit
Memory Bus
512bit
160.0GB/s
Bandwidth
106.0GB/s
Render Config
24
Compute Units
4
1536
Shading Units
320
96
TMUs
16
32
ROPs
16
8 KB (per CU)
L1 Cache
-
512 KB
L2 Cache
256 KB
Theoretical Performance
26.56 GPixel/s
Pixel Rate
11.89 GPixel/s
79.68 GTexel/s
Texture Rate
11.89 GTexel/s
2.550 TFLOPS
FP32 (float)
475.5 GFLOPS
637.4 GFLOPS
FP64 (double)
-
Board Design
375W
TDP
215W
750 W
Suggested PSU
550 W
1x DVI
4x mini-DisplayPort 1.2
Outputs
2x DVI
1x S-Video
2x 8-pin
Power Connectors
1x 6-pin + 1x 8-pin
Graphics Processor
Antilles
GPU Name
R600
Antilles XT
(215-0807027)
GPU Variant
R600 XT
(215RGMDKA13FG)
TeraScale 3
Architecture
TeraScale
TSMC
Foundry
TSMC
40 nm
Process Size
80 nm
2.64 billion
Transistors
0.72 billion
389 mm²
Die Size
420 mm²
Graphics Features
11.2 (11_0)
DirectX
10.0 (10_0)
4.4
OpenGL
3.3 (full)
4.0 (partial)
1.2
OpenCL
N/A
N/A
Vulkan
N/A
5.0
Shader Model
4.0
