Quote Originally Posted by DGLee View Post
Thanks a lot for your info, Formula350
Frankly I'd never thought of them - tWRWR & tRDRD. Really impressive that they affect performance that much.
Maybe I'll retry on them sooner or later
I had a friend change them on his DDR2 and didn't show any benefit in Sandra for RDRD and WRWR(For some reason it won't install on my computer so I can't compare that way, but I'm going to reinstall 7 soon anyways), but dropping down just the Max Read Latency by 2ns resulted in a 250-300mb/s improvement!


Quote Originally Posted by Sanousie View Post
Welcome to XS

Very nice thread, good info, effort well done.

If you would be kind enough to post some info on other subtimings, Im having trouble getting these sticks to run at 2000mhz, maybe with some input from your subtimings i can get them to work, Thanks.

E.g here is a cut and paste from aida/everest under motherboard/chipset/Northbridge AMD K10 IMC

Memory Controller
Type Dual Channel (128-bit)
Active Mode Dual Channel (128-bit) - Unganged

Memory Timings
CAS Latency (CL) 8T
RAS To CAS Delay (tRCD) 8T
RAS Precharge (tRP) 8T
RAS Active Time (tRAS) 26T
Row Cycle Time (tRC) 27T
Command Rate (CR) 1T
RAS To RAS Delay (tRRD) 4T
Write Recovery Time (tWR) 8T
Write To Read Delay (tWTR) 4T
Read To Precharge Delay (tRTP) 4T
Four Activate Window Delay (tFAW) 18T
Write CAS Latency (tWCL) 6T
Refresh Period (tREF) 7.8 us
DRAM Drive Strength 1.0x
DRAM Data Drive Strength 1.0x
Clock Drive Strength 1.5x
CKE Drive Strength 1.5x
Idle Cycle Limit 16
What brand and model of DDR3 are you running? With out knowing the factory specs it's hard to say what to really adjust.

I won't pretend to know what I'm talking about with the DDR2/3 setups since I upgraded from S939 with DDR1, BUT...

General rule of thumb is: tRAS + tRP = tRC, so for you 26+8=34. You have it set at 27. I don't think that it's preventing you from hitting 2000MHz, but it's a start.

A few other things I'd be try changing to:
CL-tRCD-tRP - 9-9-9
Command Rate - 2T
Write CAS Latency (tWCL) - 8T (If you can change this)

Increase the voltage of the memory a little
Increase CPU-NB voltage (that is the memory controller)
Increase the actual NB voltage (have heard it helps a little)

That's all I can think of w/o knowing you memory model. GL!