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Crossfire APU + AMD video card

post #1 of 5
Thread Starter 
I've just learned that it is possible to crossfire APU with AMD video card; however, I have some questions about
- First of all, is it possible to overclock the APU (CPU and GPU in it) so that GPU of the APU would have the same frequency as the GPU in the graphics card?.
- is APU a good overclocker (how much can GPU and CPU be overclocked)?
- When APU and AMD video card are crossfired, does the computer uses the fastest memory (the video card memory) or it uses both of the memories (the DDR3 from the motherboard and DDR5 from the graphics card)?


- And please share your experience with APU and gaming.
post #2 of 5
It's possible to overclock the CPU and GPU portion of the APU. You can run them at the same frequency but the main bottleneck is DDR3 so going with the fastest ram you can is your best bet. I've read that Richland are great overclockers and from first hand experience, Kaveris top out at 4.4-4.5ghz on the CPU side. I've never pushed the GPU side so I can't tell you how far it can go since I run a dGPU on my system. If you're planning to dual graphics crossfire an APU I suggest running a 7850k with Radeon R7 250 but honestly you can get better price to performance ratio with a standalone CPU and dGPU.

Only reason I'd go dual graphics is if you have enough money to buy a system without the GPU then upgrade in the future or if you're trying to build a miniITX build and the largest cards you can fit are the 250's. It'll be enough to run most games, not on the highest settings on the newer titles though.
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post #3 of 5
You can do it, but it's limited to certain combinations. A dual-core A6 can crossfire with a 6450, a Trinity or Richland A8 or A10 with a 6570 or 6670, and a Kaveri 7850K with a 7750, R7 240 or R7 250.

It doesn't always work well due to driver issues. Some games have too much microstutter or experience negative scaling when you use Dual Graphics, but others work just fine. AMD's latest drivers have supposedly fixed some of the issues, but how much, I don't know.

More often than not, if someone thinks they might want to upgrade their graphics, I tell them to buy a dedicated GPU to start with, even if they're on the FM2/FM2+ platform. You can buy an Athlon for less than an equivalent A-series and then add your own GPU.
     
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CPUMotherboardGraphicsRAM
AMD Athlon X4 870K 4700mhz 1.63v ASUS A88X-PRO Radeon HD 6970 G.SKILL Ripjaws X Series 16GB DDR2133 
Hard DriveHard DriveHard DriveHard Drive
Kingston V300 Toshiba 2.5" laptop HDD, 1TB Micron C300 SSD Generic 2TB HDD WL2000GSA1672 (external) 
Hard DriveOptical DriveCoolingOS
Seagate Momentus XT 500GB ASUS DVD-RW Prolimatech Black Series Megahalems Linux Mint 18 Cinnamon "Sarah" 
OSMonitorKeyboardPower
Windows 10 ViewSonic VG2030wm IBM Model M Fractal Design Newton R3 600W 
CaseMouseAudioOther
Phanteks Enthoo Pro Logitech Marble Mouse Behringer UCA222 Upgraded Realistic Minimus-7 speakers, Lepai 20... 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo Mobile T9900 Dell 0G848F Intel Mobile 4 series 4GB Crucial DDR2-6400 
Hard DriveOptical DriveOSMonitor
OWC Mercury Electra 3G 44GB SSD stock DVD-RW Linux Mint Cinnamon 17.1 "Rebecca" 1366x768 WXGA 
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post #4 of 5
If I were you I would use a r9 270x and mantle any other setup will have stuttering on their hybrid crossfire
post #5 of 5
Poor performance per dollar.

Here is an example. The prices of each setup at the time of testing are included at the top of the article.

http://wccftech.com/dual-graphics-showdown-amd-a10-7850k-kaveri-intel-i3-4330/
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