AMD Radeon RX 6600 XT vs AMD Radeon HD 8990 OEM

AMD Radeon RX 6600 XT on Amazon USA
AMD Radeon HD 8990 OEM on Amazon USA

Comparison of the technical characteristics between the graphics cards, with AMD Radeon RX 6600 XT on one side and AMD Radeon HD 8990 OEM on the other side. The first is dedicated to the desktop sector, it has 2048 shading units, a maximum frequency of 2.5 GHz, its lithography is 7 nm. The second is used on the desktop segment, it includes 4096 shading units, a maximum frequency of 1.0 GHz, its lithography is 28 nm. The following table also compares the boost clock, the number of shading units (if indicated), of execution units, the amount of cache memory, the maximum memory capacity, the memory bus width, the release date, the number of PCIe lanes, the values ​​obtained in various benchmarks.


Graphics card AMD Radeon RX 6600 XT AMD Radeon HD 8990 OEM
Market (main) Desktop Desktop
Release date Q3 2021 Q2 2013
Model number Radeon RX 6600 XT 215-0849026, Malta XT
GPU name Navi 23 Malta
Architecture RDNA 2.0 GCN 1.0
Generation Navi II RX 6000 Sea Islands HD 8900
Lithography 7 nm 28 nm
Bus interface PCIe 4.0 x16 PCIe 3.0 x16
GPU base clock rate 1.49 GHz 950 MHz
GPU max clock rate 2.50 GHz 1.00 GHz
Memory frequency 2,000 MHz 1,500 MHz
Memory size 8 GB 6 GB
Memory type GDDR6 GDDR5
Memory bus 128 bit 768 bit
Memory bandwidth 256 GB/s 572 GB/s
TDP 180 W 375 W
Suggested PSU450W ATX Power Supply 750W ATX Power Supply
Multicard technology - -

2x DisplayPort

1x DVI
4x mini-DisplayPort
Shading units 2,048 4,096
TMUs 128 256
ROPs 64 64
Compute units 32 64
Cache memory 32 MB 1.5 MB
Pixel fillrate 160.0 GP/s 64.0 GP/s
Texture fillrate 320.0 GT/s 256.0 GT/s
Performance FP32 (float) 10.2 TFLOPS 8.2 TFLOPS
Performance FP64 (double) 640 GFLOPS 2.0 TFLOPS

Price: For technical reasons, we cannot currently display a price less than 24 hours, or a real-time price. This is why we prefer for the moment not to show a price. You should refer to the respective online stores for the latest price, as well as availability.

We can better compare what are the technical differences between the two graphics cards.

Performances :

Performance comparison between the two processors, for this we consider the results generated on benchmark software such as Geekbench 4.

FP32 Performance in GFLOPS
AMD Radeon RX 6600 XT 10,240
AMD Radeon HD 8990 OEM 8,192

The difference is 25%.

Single precision floating point format, also known as FP32, is a computer number format that typically occupies 32 bits in PC memory. This represents a wide dynamic range of numeric values that employs a floating point.


AMD Radeon RX 6600 XT Nvidia equivalentAMD Radeon HD 8990 OEM Nvidia equivalent © 2021 - Information - XML sitemap - Privacy policy - Advertising policy - Contact


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