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Memory Speed

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June 28, 2010 6:10:28 PM

I have 3x2GB of OCZ Platinum DDR3 RAM at 1600MHz and 7-7-7-16 timings.

Should I run my memory at 1000MHz with CAS 6, 1333MHz with CAS 7 or 1670MHz with CAS 8?

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a b K Overclocking
June 29, 2010 12:57:01 AM

How about...

Set it to CAS 6 and somewhere near 1600MHz... then slowly lower your memory frequency until it's stable.

For example: I have 1600MHz RAM rated at 9-9-9-24, but I lowered it's frequency to about 1540 and it happily runs at 8-8-8-21. Almost the best of both scenarios.

EDIT: Wait... why 1333 at CAS 7? Your RAM is rated at 1600 / 7-7-7-16?
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a b K Overclocking
June 29, 2010 12:24:35 PM

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July 6, 2010 1:58:29 AM

redechelon said:
How about...

Set it to CAS 6 and somewhere near 1600MHz... then slowly lower your memory frequency until it's stable.

For example: I have 1600MHz RAM rated at 9-9-9-24, but I lowered it's frequency to about 1540 and it happily runs at 8-8-8-21. Almost the best of both scenarios.

EDIT: Wait... why 1333 at CAS 7? Your RAM is rated at 1600 / 7-7-7-16?


Because my i7 is overclocked to 3.5GHz (167x21) and with the standard memory multiplier of 12, I get ~1670 MHz. I memory will NOT run that stably with CAS 7, I end up having to go 8. Reducing the multiplier to 10 gets me 1336 MHz, at which it can do CAS 7. There is no in-between.
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a b K Overclocking
July 6, 2010 2:39:36 AM

raybob95 said:
Because my i7 is overclocked to 3.5GHz (167x21) and with the standard memory multiplier of 12, I get ~1670 MHz. I memory will NOT run that stably with CAS 7, I end up having to go 8. Reducing the multiplier to 10 gets me 1336 MHz, at which it can do CAS 7. There is no in-between.


Sheesh, you never specified that you were running your CPU at 3.5GHz..
If your BCLK is at 167, your memory multiplier is at 10x, not 12x. 167 x 10 = 1670MHz

3.5Ghz is an odd choice... it forces you to overclock your memory, something like 3.4 or 3.6 would likely be better in your case.
All I was suggesting is that you can lower your RAM frequency slightly and get much better performance out of it.
I wasn't suggesting trying to run your RAM at 1670MHz AND CAS 7, I was suggesting you lower your RAM frequency a tiny bit (like the settings below) and THEN try CAS 7.
RAM at 1520MHz & CAS 7 will perform better than RAM at 1600MHz & CAS 8.

Possible Settings:

160 x 21 = 3.36GHz
RAM 160 x 10 = 1600MHz

190 x 19 = 3.61GHz
RAM 190 x 8 = 1520MHz (HERE is where you could try CAS 7)
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