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Need help choosing the best GPU for my build : AMD A10-5800k Hybrid Crossfire

Before I write my question here are the specs of my build :

Quote:
Motherboard: MSI FM2-A85XA-G65
Processor: AMD A10-5800K 3.8Ghz (running @4.2Ghz)
CPU Cooler: Cooler Master Seidon 120M (Push/Pull Config)
RAM: G.Skill Ares 8GB (2x4GB) 1866
HDD: 1TB Caviar Blue 7200RPM
Power Supply: Thermaltake SmartSE 730W Modular
Case: NZXT Lexa S Crafted Gaming Armor


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Question 1 : I'm planning to go for Hybrid Crossfire, what would be the best GPU to maximize the power of my APU ?

Question 2 : Would my current power supply support the 2 of the cards ?

Question 3 : My original plan was buying an R9 280X but other people said that the A-Series is much better if I go for Hybrid Crossfire with 2 7750's , is it true ?

Question 4 : If it's true , how is it better ?

Question 5 : Is the 7750's my last choice if I'm going for Hybrid Crossfire ? Can't go anymore for much higher cards ?
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Thanks :)
2 answers Last reply Best Answer
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  1. Best answer
    no. a single 280x easily beats the 3 other cards put together. hybrid crossfire is a very weird tech, problem with it is that you need similarly performing cards for it to work ok and since the built in gpu is weak the sum will be weak to medium too. (and this is because discreet gpu-s have a faster refresh/increase cycle compared to the gpu-s integrated in cpu-s).

    even a single discreet 7750 beats in some cases the integrated + 6670 which is the best case scenario for hybrid xfire...

    using a discreet card also lets you disable the built in graphics from the apu and you get more headroom for overclocking the 4 cpu cores.
  2. laviniuc said:
    no. a single 280x easily beats the 3 other cards put together. hybrid crossfire is a very weird tech, problem with it is that you need similarly performing cards for it to work ok and since the built in gpu is weak the sum will be weak to medium too. (and this is because discreet gpu-s have a faster refresh/increase cycle compared to the gpu-s integrated in cpu-s).

    even a single discreet 7750 beats in some cases the integrated + 6670 which is the best case scenario for hybrid xfire...

    using a discreet card also lets you disable the built in graphics from the apu and you get more headroom for overclocking the 4 cpu cores.


    so if i'm going for r9 280x its still good ? it wont bottleneck?
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