Topic Title: Optimal RAM for FX8350 Vishera 4.0 GHZ
Topic Summary: What RAM configuration is best for 16 GB total?
Created On: 01/03/2014 12:51 AM
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 01/03/2014 12:51 AM
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Hello All, I have happily decided to go with the following:

CPU: FX8350

Motherboard: SABERTOOTH 990FX

GPU: R9 280X

I want 16 GB of RAM to do mostly gaming, some video editting, some music editting. I do not plan on exanding RAM anytime soon. What is the optimal RAM set up? 

1 (2x8) 

2 (1x8)

2 (2x4)

4 (2x2)

4 (1x4)

I have spent hours trying to figure this out and hope that I can get an answer here on the AMD forums. I know I want the lowest CAS number and the highest timing. I also read somewhere that the motherboard will always check all four RAM slots for RAM and thus I should fill all of them. But then I read that as long as I have 2 RAM slots filled running in dual mode I will be fine. Thank you very much for any help, even if it is a link to another webpage for me to read!!!! Cheers


My build:

(Currently assuming that 2 (1x8) is best RAM config?)

 01/03/2014 09:36 AM
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2x8GB is supposedly the best way to go as it puts less stress on the memory controller.

AMD FX-8350 w/ Corsair H105, ASUS Sabertooth 990FX Gen3/R2, 8GiB G.SKILL DDR3-2133, XFX HD 7970 GHz Edition, 1TB Samsung 850 Evo, 256GB OCZ Vector, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, Corsair C70, HP ZR2440w, Win 7 Ult Ed x64
 01/03/2014 09:49 AM
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As far as performance is concerned 2 Dimms is all you need so that you can run dual-channel mode.

Extensive testing of both AMD and Intel CPU powered desktops has shown no tangible benefit to RAM frequency higher than 1600 MHz. when running REAL applications. Benches show "potential" benefits to higher frequency or lower latency RAM but because DDR3 RAM running at 1600 MHz. is not a system bottleneck, there are no real gains with faster RAM like in the old days with DDR and DDR2.

I personally recommend 1866 MHz. RAM for the FX processors as that is the default RAM frequency but 1600 MHz. will show no appreciable system performance reduction.

The quantity of RAM is dependent on your O/S and application software. With a 64 bit O/S you can use more than 4 GB. With a 32 bit O/S more than 4 GB. doesn't actually get used even if you install more. For most people 8GB. of RAM is just fine. Some folks that have software that can use more RAM opt for 16GB. The more RAM you use the more strain you place on the internal memory controller so more is not always better. 2x 4GB. 1600 MHz. or 1866 MHz. would be my recommendation. If you can actually use 16GB. then 2x 8GB. would be OK also.

Good brand name RAM comes with a lifetime warranty and you may need it the way I see newer RAM failing in a few weeks to a few months. Buy the RAM as ONE MATCHED KIT to prevent issues. Mixing of two or more kits even of the same part number has been known to cause issues for some PCs.

FWIW, you do NOT need top mounted RAM heatsinks with DDR3 RAM as it runs cool. The top mounted RAM heatsinks cause clearance issues with quality, large tower style CPU heatsink/fans that are required if you overclock your 8-core FX CPU or run it max load a lot.


Technical ignorance is NOT a destiny it is a choice. Do your homework so that you can make technically informed decisions and not be duped by advertising hype or mis-information stated as fact when its not.


 01/03/2014 04:14 PM
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Originally posted by: AMDforMe  


FWIW, you do NOT need top mounted RAM heatsinks with DDR3 RAM 



Yeah, but it looks great !!  


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 01/03/2014 08:24 PM
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Thank you very much everyone for your input! I think I will go with the 2x8 GB as I think I can use all 16 GBs once I get them installed! I really appreciate all the help that you guys provided! Have a good night!

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