Super low latency RAM required - 1N vs 2N etc???

DamoTourettes · 22 Jun 2012 at 17:50

Hi all,

I have ~30 heavily overclocked servers (SB 2700k's @ a minimum of 5.1Ghz) in the wild presently, all of which are running 4GB of GSKILL RIPJaws at 1600Mhz with CAS timings of 6-8-6-24-2N @ 1.5v (product code F3-12800CL6D-4GBXH).

I wanted to buy some more to replace this, however I've seen the Samsung Green RAM on the market which appears to offer similar timings (7-8-8-24 1N) at low voltages.

Basically I'm wondering if it might be possible to turn the Samsung down to super low timings (our applications are ridiculously latency sensitive - i.e. nanosecond sensitive), so I could replicate the 6-8-6-24 timings of the GSkill stuff, but I'm also unsure what the difference between 1N and 2N is? Does this help with RAM latency at all?

Thanks a lot in advance.

wazza300 · 22 Jun 2012 at 18:41

1n will help reduce latency as its quicker than 2n,you should do the gskill timings with the samsung ram if you up the dram voltage from spec 1.35v,maybe 1.45v-1.5v @1600mhz,you would need to test

DamoTourettes · 22 Jun 2012 at 18:50

Dude, that's a really great response. Thanks a lot for the info. Just as a matter of interest, why is 1N faster than 2N?

wazza300 · 22 Jun 2012 at 18:54

it counts to 1n sooner than 2n think of timings as 1-10 and you count them,the lower the number the faster/quicker it is to get too ect hence tighter timings will be quicker/lower latency than looser timings

DamoTourettes · 22 Jun 2012 at 19:05

Very much appreciated!

tamzzy · 23 Jun 2012 at 15:16

iirc, 1n = processor uses 1 clock to send out the instuctions, 2n = 2 clocks,
so in effect, 6-8-6-24-2N roughly equals 7-9-7-25 1n