Memory Speed

[raybob95]

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?

 

[RJR]

Not a big difference in real world applications, but up to you:

http://www.anandtech.com/show/2792/1

http://www.tomshardware.com/reviews/core-i7-870-1156,2482.html

 

[redechelon]

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?

 

[Guest]

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[raybob95]

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.

 

[redechelon]

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)