Home GPU Comparison AMD Radeon HD 8870 OEM vs AMD Radeon RX 6600 XT

AMD Radeon HD 8870 OEM vs AMD Radeon RX 6600 XT

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 8870 OEM and 8GB VRAM Radeon RX 6600 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6600 XT 's Advantages
Released 8 years and 6 months late
Boost Clock2589MHz
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (256.0GB/s vs 153.6GB/s)
768 additional rendering cores
Lower TDP (160W vs 175W)

Score

Benchmark

FP32 (float)
Radeon HD 8870 OEM
2.56 TFLOPS
Radeon RX 6600 XT +314%
10.6 TFLOPS
VS

Graphics Card

Jan 2013
Release Date
Jul 2021
Sea Islands
Generation
Navi II
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 4.0 x8

Clock Speeds

-
Base Clock
1968 MHz
-
Boost Clock
2589 MHz
1200 MHz
Memory Clock
2000 MHz

Memory

2GB
Memory Size
8GB
GDDR5
Memory Type
GDDR6
256bit
Memory Bus
128bit
153.6GB/s
Bandwidth
256.0GB/s

Render Config

20
Compute Units
32
-
-
-
1280
Shading Units
2048
80
TMUs
128
32
ROPs
64
-
-
-
-
RT Cores
32
16 KB (per CU)
L1 Cache
128 KB per Array
512 KB
L2 Cache
2 MB
-
L3 Cache
32 MB

Theoretical Performance

32.00 GPixel/s
Pixel Rate
165.7 GPixel/s
80.00 GTexel/s
Texture Rate
331.4 GTexel/s
-
FP16 (half)
21.21 TFLOPS
2.560 TFLOPS
FP32 (float)
10.60 TFLOPS
160.0 GFLOPS
FP64 (double)
662.8 GFLOPS

Board Design

175W
TDP
160W
450 W
Suggested PSU
450 W
1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2
Outputs
1x HDMI 2.1 3x DisplayPort 1.4a
2x 6-pin
Power Connectors
1x 8-pin

Graphics Processor

Pitcairn
GPU Name
Navi 23
Pitcairn XT (215-0828047)
GPU Variant
Navi 23 XT (215-130000006)
GCN 1.0
Architecture
RDNA 2.0
TSMC
Foundry
TSMC
28 nm
Process Size
7 nm
2.8 billion
Transistors
11.06 billion
212 mm²
Die Size
237 mm²

Graphics Features

12 (11_1)
DirectX
12 Ultimate (12_2)
4.6
OpenGL
4.6
1.2
OpenCL
2.1
1.2
Vulkan
1.3
-
-
-
5.1
Shader Model
6.7

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