Solved RAM Bandwidth vs Latency for 8 Core CPU

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January 25, 2014 at 18:20:38
Specs: Windows 8.1 64 Bit, AMD FX-8350 8 Core @ 4.0 GHz w/ 2x4 DDR3-1600
Hey All,

I am thinking about getting some more RAM for my desktop computer. Based on looking around, I noticed that RAM with higher Bandwidth tends to also have more latency, too. I currently have an 8 Core @ 4.0 GHz, and I was wondering if it could fully utilize the bandwidth of, lets say, DDR3-2133. Or would I be better off just getting 1600 and having better timings?

I know my FSB can handle 8532 MHz (4 x 2133, Motherboard has 4 DIMMs) so that shouldn't be a problem, mostly just a matter of what the processor can handle.


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January 25, 2014 at 19:12:43
Does High-Speed DDR3 Help AMD's FX?

This pretty much sums it up - "At the end of the day, you will need to be the judge of whether or not the added expense is worth the marginal performance increase"

BTW, you don't have to accept default memory timings. You can try tightening them up manually in the BIOS & see how it goes. If the system becomes unstable, simply change them back.

message edited by riider

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January 25, 2014 at 20:40:52
Alright, thanks.

Another question, since my motherboard only supports up to 2133 ram, does that mean I could still overclock the ram past that?


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January 26, 2014 at 12:37:58
✔ Best Answer
Are you asking about the MSI 970A-G43 board you mentioned in your other post? Notice the memory spec >> "Supports four unbuffered DIMM of 1.5 Volt DDR3 1066/1333/1600/1866/2133* (OC) DRAM"

A few things are in play here:

1st of all, notice that to be able to run the DDR3-2133 RAM, it has to be overclocked. "Overclocked" probably isn't the best term because you don't have to overclock DDR3-2133 to get it to run at 2133MHz (1066MHz freq). What it really means is the BIOS RAM settings will have to be manually configured to get it to run at the proper speed.

2nd, notice the board specs the RAM voltage at 1.5v. That means the only official JEDEC RAM is supported & the max limit for JEDEC DDR3 is 2133. If you check the voltage for any of the higher speed RAM (DDR3-2400, 2666, 3000, etc), you'll see it's 1.65v or higher.

3rd, the memory controller is in the CPU not the motherboard. The FX-series (with the exception of the FX-9590) only officially supports up to DDR3-1866.

Why do you feel you need faster RAM?

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January 26, 2014 at 18:17:44
To be honest, I don't really need faster RAM, I was just thinking about upgrading sometime in the future, and wanted to get good ram should I choose to get more.

I noticed that you said the processor only OFFICIALLY supports DDR3-1866, so does that mean it could be manually configured to use a higher speed ram?


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