help with memory OC 4-3-3-8-16-T2

xgeek · 10 Mar 2007 at 12:18

Hi Guys,

If possible I would like some advise on memory settings.

I built my new rig last week and at the moment it is set-up like this:-
Mobo P5N-E SLI
E6600
OCZ 2GB (2 x 1GB) PC2-6400 Dual Channel Platinum Revision 2 XTC

425x8 = 3400MHz
4-4-4-12-24-T2
Orthos stable
Idle temps
Core 1 23c
Core 2 24c
load temps around 47c

VCore voltage = 1.4
VCore Offset Voltage = +100mV
Memory Voltage = 2.085
NB Core Voltage = 1.563

I am very happy with that but I am confused over memory settings.
I can get the memory to 4-3-3-8-16-T2 and still be Orthos stable but I am not sure if by running at these settings I am making the system faster or slower.

Is it the lower the numbers the better with RAM? I see in most members sigs that they run at either 4-4-4-12-T2 or 4-4-4-8-T2. Is that because that's the best setting.

I also see no one mentions bank cycle time Trc. On auto mine is at 24 at 4-4-4-8-T2 but I can get it to 16 and still be Orthos stable. Is it okay to lower that or should I leave it at 24?

Many thanks in advance for any advice. :confused:

Cob · 10 Mar 2007 at 14:47

Yip the lower the better.

4-3-3-8 @425mhz is very good for the OCZ RAM. The 2 pairs I had wouldn't drop below 4-4-4-10 @400mhz.

xgeek · 10 Mar 2007 at 19:40

Okay many thanks.

Does that go for the Trc setting as well?
I see from most screen shots of other users cpu-z that Trc is greyed out. Still not sure if I should tweak that setting or not :confused:

Cob · 10 Mar 2007 at 19:46

If it's stable at 16 then you don't need to worry.

xgeek · 10 Mar 2007 at 19:54

Cool thanks.

simonnance · 12 Mar 2007 at 21:52

Trc = Trp + Tras (ideally at least), and the lower the better! What Trfc are you using (in BIOS, CPU-Z doesn't detect it), 2-4 greater than Trc is generally optimum.

Nice low Tras though on that, have you tried Memtest to see if its stable?

xgeek · 13 Mar 2007 at 10:15

yes the system is Orthos stable and I have left memtest86 running overnight without errors.

Trfc is set to auto in the bios so not sure how to check what it is set at?

james32 · 13 Mar 2007 at 13:11

xgeek said:
Okay many thanks.

Does that go for the Trc setting as well?
I see from most screen shots of other users cpu-z that Trc is greyed out. Still not sure if I should tweak that setting or not

bring the Trc down to 11
on my motherboard when i set 4.3.3.8 timings trc is automatically set by TRAS
which is 11 it should improve winrar benchmark by a bit.

ubern00b · 13 Mar 2007 at 14:58

You could also use MemSet to see what the subtimings are, and also to set them while in windows.

xgeek · 13 Mar 2007 at 16:45

I tried setting Trc to 11 and I blue screen going into Vista X64. I then tried 12,13,14 and it still BSOD. At 15 it did boot but just to be safe I put it back to 16 as I know I am Orthos stable at that timing.

Did a quick google on memset and found v3.0. That does not work with my 650i chipset. Not sure if v3.0 is the latest?

ubern00b · 14 Mar 2007 at 13:19

MemSet 3.2

http://rv.page.cegetel.net.perso.cegetel.net/MemSet.exe

xgeek · 14 Mar 2007 at 20:33

Many thanks ubern00b that works great even on Vista x64.

Okay here is a screen shot of all memory settings. From this my Trfc is 45. Is that good? Other than the x-x-x-x-Tx settings I am not sure what to tweak and what to leave alone :confused:

simonnance · 15 Mar 2007 at 16:51

TRFC, TWR, TWTR, and TRRD are very slack given the tight timings you are using otherwise. Try dropping TRFC to 2-4 above TRC, or as close to that as is stable, then try dropping the others slowly

raja · 15 Mar 2007 at 20:44

trfc can be dropped, try bringing down to 21-28. On this chipset Trc can be set to 8 or so with good stability, you can go lower but it will not give optimum bandwidth in every benchmark. Vdimm and Vnb will effect latency capability.

As an example on the cellshock at 2.325vdimm and vnb at 1.55 under water cooling here's my timings in bios and ntune, just a generalisation in some areas you can explore for 24/7 use..

Twtr will be ok at 6, lower will cause instability, trrd 3, twr3... or so, just ballparks, you will have to experiment on your rig/setup.

http://forums.overclockers.co.uk/showpost.php?p=8915776&postcount=17
http://forums.overclockers.co.uk/showpost.php?p=8922379&postcount=21

Chipsets tend to scale vnb and vdimm according to overall thruput, everest latency with the above settings was around 47 or so at 1.55vdimm. The chipset will supply this level of bandwidth per volt and the cat can be skinned another way to attain it (assuming bios is setup to allow it properly)..

regards
Raja