ECS A75F-A User Manual page 64

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Recommendation
1.The APU in the A75 platform delivers a discrete-class of graphics performance
and enables leading GPU compute capability
-Adding a discrete GPU is optional to extend graphics and GPU compute capacity
2.For optimal performance uplift, AMD recommends Dual Graphics (CrossFire
Technology) combinations of
-A4 and Discrete GPU model Radeon HD6450
-A6 and Discrete GPU model Radeon HD6570
-A8 and Discrete GPU model Radeon HD6570 or HD6670
3.AMD recommends a balanced system memory configuration of at least 4GB of
1333-DDR3 (2GB x 2GB).
Single channel and unbalanced memory configuration can promise both APU and
Dual Graphics performance.
4.CrossFire
due to the limitation by AMD.
CrossFire
TM
Technology (AMD Dual Graphics) Support on OS Windows 7 only
Technology [AMD Dual Graphics] Support
TM
TM