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Lower frequency than expected

Last response: in Memory
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October 30, 2010 9:57:40 PM


Hello, I have a question about memory frequency. I have two memory modules of the type 4 GB Corsair XMS3 DDR3 1333MHz.

Today I tried the Memtest86+ tool and runned the test for a few hours, everything looked good. However I noticed that the tool displayed the memory as running as:

535 Mhz (DDR3-1070) / CAS 7-7-7-20 / Dual Channel

As I do not know these memory internals I am not sure if this is normal and expected, or is something wrong when this supposed 1333 Mhz maybe is running at 535?

Inside Windows I runned cpuz which seems to display the same result, see below.
So, normal or strange?


October 30, 2010 11:05:03 PM


When seeing Jaxx89 new thread with a very similar question, I could also add some more information:

CPU: Intel Core i7 860 2,8 Ghz
Motherboard: ASUS P7P55D-E LX

No overclocking is done.
November 7, 2010 9:59:13 AM


Hello, sorry to bump the thread, but I am still curious about this. I would be very grateful if anyone could confirm that this is normal or something unexpected?
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a b } Memory
November 7, 2010 10:50:46 AM
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Its fine,
basically you take the number its running at, times it by 2 and that gives you the rams speed, i.e. 535x2=1070MHz, which although isn't 'full speed' is fine.
if you look on your cpu-z screen, it shows that ram timings you have are 7-7-7-20-27, change them in bios to the timings under Jedec4 9-9-9-26-35, that should get you closer to 1333Mhz
Moto
November 9, 2010 7:15:54 AM

Motopsychojdn said:
Its fine,
basically you take the number its running at, times it by 2 and that gives you the rams speed, i.e. 535x2=1070MHz, which although isn't 'full speed' is fine.


Thanks a lot for your answer! The most important thing is just that it is fine, and if not perhaps optimal it is still normal. I might later do these BIOS adjustments you mention, but for the time being I will keep it default.

Thanks for just clearing that up.
a b } Memory
November 9, 2010 7:19:28 AM

No problem, glad to help :) 
Moto
November 9, 2010 7:23:13 AM

Best answer selected by ricno.
a b } Memory
November 9, 2010 7:25:34 AM

Thank you for B.a. man :) 
Moto
!