FX 8120 bottleneck a crossfire of 2 HD7770s ?

hunter86_bg · Dec 6, 2013

Hello guys, I have a FX 8120 which performs well both with old and new games. Sadly my mobo is not so good / and MOSFET is keep throttling the CPU when I OC/ and as a result I can rely only on AMD's Turbo to get it to 4Ghz. I play a very GPU demanding game which on top of that is Single Threaded. Yes, You read it correctly -single thread. I have tested the game with stock and turbo speeds and I see no difference.
So, my main question is - will this CPU bottleneck 2 HD7770s /stock OC/ or it can cope with them and I can get a second GPU really cheap.

Novuake · Dec 6, 2013

What motherboard do you have?
What power supply do you have?

Valentin_N · Dec 6, 2013

if it's gpu then no but I hope you are aware that the fx cpu performs bad in single threaded applications so I suggest you try to see if the game has a patch that supports multicore cpu.

noob2222 · Dec 6, 2013

no. at stock you would probably need about 7950 CF range to start bottlenecking the gpus, and thats assuming 3.1 ghz. I run 6970 crossfire at 4.5 ghz without any issues and usually cpu usage is under 75%.

hunter86_bg · Dec 6, 2013

Well ... That's good to hear ,because upgrading from Asrock FX990 Extreme 3 to Extreme 9 will be more costly than the GPU upgrade.
Edit: Turbo Frequency is 4Ghz and I think I can up it a little bit . It's not the CPU cooling that stops me. I have OCed the CPU up to 4Ghz but the MOSFET is still thermal throttling / I removed the stock heatsink and put a Thermalright HR-09 U type2 heatsink/. Having in mind the game is using 1 / sometimes 2 threads/ I can stay on default clocks and use the turbo.

CTurbo · Dec 6, 2013

In older cpu demanding games the 8120 will struggle a little. Shouldn't be too bad though. It has the single core performance of a lower-mid range Celeron or Pentium.
You would see an big increase by upgrading to a FX 4300, a huge increase by upgrading to a FX 6300, and a tremendous increase by upgrading to a FX 8350.

hunter86_bg · Dec 8, 2013

CPU upgrade is not an option.

Valentin_N · Dec 9, 2013

may I ask what your budget is?

hunter86_bg · Dec 9, 2013

Haven't decided yet ... but selling a CPU is hard- in my country
As most people won't give more than 50 Euro for a CPU.

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