Radeon HD 4870 vs GeForce GT 640 OEM Rebrand
We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4870 and 1536MB VRAM GeForce GT 640 OEM Rebrand to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon HD 4870 's Advantages
Larger VRAM bandwidth (115.2GB/s vs 38.40GB/s)
656 additional rendering cores
GeForce GT 640 OEM Rebrand 's Advantages
Released 3 years and 10 months late
More VRAM (1536GB vs 512GB)
Lower TDP (75W vs 150W)
Score
Benchmark
FP32 (float)
Radeon HD 4870
+189%
1200
GeForce GT 640 OEM Rebrand
415
Graphics Card
Jun 2008
Release Date
Apr 2012
Radeon R700
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 2.0 x16
Bus Interface
PCIe 2.0 x16
Clock Speeds
900 MHz
Memory Clock
800 MHz
Memory
512MB
Memory Size
1536MB
GDDR5
Memory Type
DDR3
256bit
Memory Bus
192bit
115.2GB/s
Bandwidth
38.40GB/s
Render Config
10
Compute Units
-
-
SM Count
3
800
Shading Units
144
40
TMUs
24
16
ROPs
24
16 KB (per CU)
L1 Cache
64 KB (per SM)
256 KB
L2 Cache
384 KB
Theoretical Performance
12.00 GPixel/s
Pixel Rate
4.320 GPixel/s
30.00 GTexel/s
Texture Rate
17.28 GTexel/s
1200 GFLOPS
FP32 (float)
414.7 GFLOPS
240.0 GFLOPS
FP64 (double)
34.56 GFLOPS
Board Design
150W
TDP
75W
450 W
Suggested PSU
250 W
2x DVI
1x S-Video
Outputs
2x DVI
1x mini-HDMI 1.3a
2x 6-pin
Power Connectors
None
Graphics Processor
RV770
GPU Name
GF116
RV770 XT
(215-0669049)
GPU Variant
GF116-150-A1
TeraScale
Architecture
Fermi 2.0
TSMC
Foundry
TSMC
55 nm
Process Size
40 nm
0.956 billion
Transistors
1.17 billion
256 mm²
Die Size
238 mm²
Graphics Features
10.1 (10_1)
DirectX
12 (11_0)
3.3
OpenGL
4.6
1.1
OpenCL
1.1
N/A
Vulkan
N/A
-
CUDA
2.1
4.1
Shader Model
5.1