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how to: tRD of 5 with 2x2GB modules!?


geok1ng

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i am trying to run my just arrived/RMAed TWIN2X4096-8500C5D at the lowest possible tRD/performance level. i dont mind operating at 1:1 divider as long as my E8600 is running at 10x400Mhz on the P5Q Deluxe.

 

What have i tried:

disable CPU and PCIe spread spectrum

CPU voltage up to 1,45

NB voltage to 1.60/1.50/1.45/1.40 all to no avail

Memory voltage to 2.1v

 

the system can run stable at CAS 4 performance level 8 :[pouts: DDR2 840Mhz, but i can not even boot at DDR2 800Mhz CAS 5 performance level 7

 

Should i:

A-try to "pull phases"? Which ones?

B-go for higher voltages? which ones?

C- try to loosen other memory timings- i wouldnt mind running CAS6, if i could reach a tRD of 5 with 400Mhz FSB.

 

For anyone interested in WHY go for lower tRDs i recommend reading

http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=9

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memset.thumb.jpg.122727f744e0992b24e82bb356fd9178.jpg

 

just finished the first day of tweakings. It was surprisingly easy to find the optimal FSB for the processor: my E8600 could do 10x404Mhz with 1.1v:D:

 

but tRD of 8 or lower was only possible at the 5:6 divider of the 333MHz strap and 3:4 divider on the 400Mhz strap. The latter was way more stable, and in the end i could even pull all phases in for an effective tRD of 6. The Everest results of 56ns for memory latency are what i would expect for a tRD of 6, but it required 1.36v on the NB:(:

 

working with this memory kit was a mixed blessing:roll:

 

A- It worked with AUTO timings at 1.86v, and reached 1077MHz WITHOUT the Dominator fan.

B-It simply refused to operate at CAS 4 above 799MHz, and stability between 800MHz and 1066MHz is feeble to say the least - i wasnt able to complete a single Orthos pass with tRd of 8 or lower at any other divider - this kit is really optimized for 1066Mhz operation:cool:

 

 

I dont know how to generate the complete BIOS dump that i see on post here, but my main points were:

STRAP 400Mhz

Memory Frequency 1066Mhz

Memory Timings auto

Memory read training DISABLED

MEMORY OC ENABLED

COMMON PERFORMANCE LEVEL 7

ALL PHASES PULLED IN

CPUv 1.15

NBv 1.36

DDRv 1.86

 

all other voltages were set to minimum, DONT LEAVE VOLTAGES AT AUTO- THE BIOS WILL OVERVOLT THE SYSTEM:eek:

 

Oh!: And the golden score of tRD 5:confused: Well the best i could hope for was using the 3:4 divider and NBv of a measly 1.58v- i was able to boot, enter Windows, run memset and see tRD of 6 (no phases was pulled in), before the system overheated and crashed:mad:

 

Even so i believe that there is a market niche for the 1100Mhz, 1150Mhz and 1200Mhz memory kits, since my E8600 CAN achieve 10x450Mhz IF i put 1.40v :evil:, but i didnt even tried to make that a 24x7 setting since the only memory setting that could be tRD 7 stable was already above the specs of the Kit.

 

My 8500C5D achieved above specs frequencies-1077Mhz - with 1.86v:D:

too BAD i couldnt find a sweetspot for 1:1 divider or CAS 4 operation, not to mention my fabled tRD 5:roll:

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When you move to DDR3 you will be pleasantly surprised.

 

Well the tRD rules aply for your system as well, just notice the last picture on

http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=7

 

45,5ns of latency, 450Mhz FSB, 3:2 divider- they achieved a better latency on a LOWER FSB and LOWER memory speed:bigeyes:

 

Maybe DDR3 1333MHz tRD 6 is faster/cooler than DDR3 1600 tRD 8?

 

Maybe you could enlight us on the subject of tRD manipulation on DDR3 MOBOs.

 

You should get amazing numbers with tRD 7 or 6, just remember to increase the NB voltage.

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