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ddr3 2133 with phenom II

post #1 of 8
Thread Starter 
I currently have a Biostar TA890FXE motherboard with a phenom II 955 cpu. I just bought a set of G.Skill snipers (ddr3 2133 2x4gb). I cant seem to get the memory to run faster than 1800. Does anyone have any suggestions of how I might be able to get the memory to run at least 2000? Also has anyone used this memory with a phenom II?
post #2 of 8
the denub memory controller strains at speed higher than 1700-1800.

Even thuban / zosma with its tweaked memory controller has a hard time above 1800. AMD memory controller was designed with ddr3 1300 in mind.

There will be little to no performance differences with higher memory speeds. Just find a comfortable memory multiplier at or below 1866 memory and tighten your timings.

added:

I cant get my 1100t comfy at anything over 1890mhz. no matter what timings or command rate. Its just the nature of the beast...

I settled for 1848mhz with decent timings for 24/7 use...

402
Edited by MadGoat - 3/5/12 at 3:00pm
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post #3 of 8
Deneb chips can't take mem speeds at 2000, simple as that. The max is like 1866 I believe.
Quote:
Originally Posted by MadGoat View Post

Even thuban / zosma with its tweaked memory controller has a hard time above 1800.
Not true. Thuban's can take 2000mhz all day long. Zosma should also. Ran this for 6 months.
Quote:
Originally Posted by MadGoat View Post

I cant get my 1100t comfy at anything over 1890mhz. no matter what timings or command rate.
What was the ram's rated timings and speed? Just because you couldn't get it to run doesn't mean all thubans do that. Sometimes your board won't play nice with the ram.
Quote:
Originally Posted by djriful View Post

Anything over 1600Mhz will causes BSOD unless you add tons of volt but that will be way too hot since you're at 1.65v.
proof.gif
Edited by just_nuke_em - 3/5/12 at 3:06pm
    
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post #4 of 8
If I were you I'd be happy with 1800 on a deneb TBH. That's quite high.

You could always try and play with the timings and command rate a bit. But IIRC it didn't do much on mine. Could only get about 1720-1750 out of it. Went with 1600ish and tight timings then.
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post #5 of 8
As others have stated, with Deneb you won't get much higher then 1800. It's a limitation of the chips integrated memory controller.
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post #6 of 8

Anything over 1600Mhz will causes BSOD unless you add tons of volt but that will be way too hot since you're at 1.65v. Simply AMD Phenom can't go high on ram speed.

 
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post #7 of 8
Thread Starter 
Thanks for the help all. I guess I will just try to lower the timings. I must say this news is a little disappointing.
post #8 of 8
If it's any consolation testing on both AMD and Intel desktop PCs has shown that with DDR3 RAM there is little to no tangible performance gains in real applications on desktop PCs once you get above ~1333 MHz.

http://www.overclock.net/t/1206332/help-me-through-my-bottleneck-6-7-6-24-1t-1333mhz/20#post_16432691

AMD Llano/APUs are the exception as both the CPU and GPU can access the higher frequency and that does improve real world performance. Increased frequency is best with the APUs. Latencies don't make any tangible diff however.

As the frequency increases one clock cycle becomes less and less in real time. Since the DDR3 RAM isn't a bottleneck there isn't much to be gained. Some folks have OC'ed the FX CPU RAM to 2400 MHz. and seen ZIP for performance gains because the RAM is not limiting performance.

Benches will show a little improvement but that doesn't seem to transfer to real apps. for most folks.

Intel has even announced they will stick with DDR3 until 2014 because it's not a bottleneck.

http://www.fudzilla.com/home/item/26169-intel-sticks-with-ddr3-till-2014
Edited by AMD4ME - 3/5/12 at 8:36pm
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