Home GPU Comparison AMD Radeon R9 390 vs AMD Radeon HD 7990

AMD Radeon R9 390 vs AMD Radeon HD 7990

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 and 3GB VRAM Radeon HD 7990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 390 's Advantages
Released 2 years and 2 months late
More VRAM (8GB vs 3GB)
Larger VRAM bandwidth (384.0GB/s vs 288.0GB/s)
512 additional rendering cores
Lower TDP (275W vs 375W)
AMD Radeon HD 7990 's Advantages
Boost Clock1000MHz

Score

Benchmark

FP32 (float)
Radeon R9 390 +25%
5.12 TFLOPS
Radeon HD 7990
4.096 TFLOPS
VS

Graphics Card

Jun 2015
Release Date
Apr 2013
Pirate Islands
Generation
Southern Islands
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16

Clock Speeds

-
Base Clock
950 MHz
-
Boost Clock
1000 MHz
1500 MHz
Memory Clock
1500 MHz

Memory

8GB
Memory Size
3GB
GDDR5
Memory Type
GDDR5
512bit
Memory Bus
384bit
384.0GB/s
Bandwidth
288.0GB/s

Render Config

40
Compute Units
32
-
-
-
2560
Shading Units
2048
160
TMUs
128
64
ROPs
32
-
-
-
-
-
-
16 KB (per CU)
L1 Cache
16 KB (per CU)
1024 KB
L2 Cache
768 KB
-
-
-

Theoretical Performance

64.00 GPixel/s
Pixel Rate
32.00 GPixel/s
160.0 GTexel/s
Texture Rate
128.0 GTexel/s
-
-
-
5.120 TFLOPS
FP32 (float)
4.096 TFLOPS
640.0 GFLOPS
FP64 (double)
1024 GFLOPS

Board Design

275W
TDP
375W
600 W
Suggested PSU
750 W
2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
Outputs
1x DVI 4x mini-DisplayPort 1.2
1x 6-pin + 1x 8-pin
Power Connectors
2x 8-pin

Graphics Processor

Grenada
GPU Name
Malta
Grenada PRO (215-0880030)
GPU Variant
Malta XT (215-0849026)
GCN 2.0
Architecture
GCN 1.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
6.2 billion
Transistors
4.313 billion
438 mm²
Die Size
365 mm²

Graphics Features

12 (12_0)
DirectX
12 (11_1)
4.6
OpenGL
4.6
2.0
OpenCL
1.2
1.2
Vulkan
1.2
-
-
-
6.3
Shader Model
5.1

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