DDR3 1600 C9 1.65v @ 1333 C7 1.5v Possible ?

[koolman007]

Hey guys,
I am thinking of upgrading soon from my X4 950 to i2500K. First i was thinking of getting 8GB DDR3 1600 Ram but there is no point as i will be using a 32bit OS...so i might as well use the old ram, underclock it to 1333mhz CAS7 @1.5 and save myself some money.
My current ram is 4GB kingston hyperX DDR3 1600 CAS9 1.6v...Upon reading the data sheet at kingston website i found that it will can run at 1333 @1.5v but there is no mention of how much the latency can be decreased..

Here are some of the features from data sheet...
Kingston’s KHX1600C9AD3K2/4G is a kit of two 256M x64-bit (2GB) DDR3-1600MHz CL9 SDRAM (Synchronous DRAM) memory modules, based on sixteen 128M x 8-bit DDR3 FBGA components per module. Total kit capacity is 4GB. Each module kit has been tested to run at DDR3-1600MHz at a low latency timing of 9-9-9-27 at 1.65V. The SPDs are programmed to JEDEC standard latency DDR3-1333MHz timing of 9-9-9 at 1.5V. Each 240-pin DIMM uses gold contact fingers and requires +1.5V. The JEDEC standard

JEDEC standard 1.5V ± 0.075V Power Supply
• VDDQ = 1.5V ± 0.075V
• 667MHz fCK for 1333Mb/sec/pin
• 8 independent internal bank
• Programmable CAS Latency: 5,6,7,8,9,10
• Posted CAS
• Programmable Additive Latency: 0, CL - 2, or CL - 1 clock
• Programmable CAS Write Latency(CWL) = 7(DDR3-1333)
• 8-bit pre-fetch
• Burst Length: 8 (Interleave without any limit, sequential with
starting address “000” only), 4 with tCCD = 4 which does not allow
seamless read or write [either on the fly using A12 or MRS]

please feel free to share your thoughts on best timing and speed/voltage for this ram..
Thanks

 

[Spikesoldier]

i think a more conservative expectation is c9 @ 1333 if you want to drop the voltage to 1.5v

if you keep it at 1.65v i think c7 @ 1333 would be possible.

you may have some superb memory though so it might make it c7 @ 1333 1.5v.

 

[MadScientist]

OP,
I have the same ram as yours except it's an 8Gb kit. Intel's Sandy Bridge (i5-2500K) max vdram spec is 1.575V. My 1.65V ram runs fine at 1600 Mhz at 1.575V, passes Memtest86+, although the difference in performance between 1333 and 1600 Mhz is probably negligible.
I doubt that it will run at CAS7 at 1333 Mhz and 1.50V. You can try.

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