F2 9600 4GBTD Tridents 785GM-US2H

[01lude]

I searched and could not find recommended sub-timings for AM2+ with the 9600 Tridents.

Mobo: Gigabyte 785GM-US2H
CPU: 955BE C3
Ram: GSkill F2-9600 4GBTD Trident CL5

CPU OC @ 3.7 1.4v
NB OC @ 2475mhz 1.25v
memory @ 1200mhz 1.8v 5-5-5-15-2,0 CR-2T, TWR-8T

Looking for help with sub-timings to max OC this memory. Any difference between 127.5ns and 195ns? Thanks.

edit: found a sticky for UD3P http://gskill.us/forum/showthread.php?t=1277 but it is the P45 intel chipset. Do the 9600's use the same IC as the 8500?

[GSKILL TECH]

Use 195ns, it will allow more refresh time.

What is your highest so far? There are a couple people on this forum that have experience doing this. You may want to look around for the threads. You may need to bump the DRAM Voltage and HT Voltage a tad, but other than this, you're on the right track.

Thank you
GSKILL TECH

[01lude]

hmm never tried increasing HT voltage. I'll see if it does anything.

right now 1225 is stable with 2.0v, it will boot with 1250 but will bsod running prime95.
+ .1v chipset voltage

can you give recommendations for TRRD (RAS to RAS) and TWTR (write to read)? is TRC =20 too low?

[GSKILL TECH]

tRRD and tWTR should be around 4. tRC = 20 is slightly low, raise a tad to see if that improves performance/stability.

Thank you
GSKILL TECH

[01lude]

yes bumping HT voltage worked a little, but it still wont stay stable at 1250mhz. could be a mobo limitation because i hear this ram is supposed to clock pretty high. the max voltage this us2h bios allows is 2.1v for the ram. could also be an IMC limitation with the ddr2 controller? Even with maxed out voltage it wont stabilize. I also found that pushing ram to 1200++ while pushing the IMC to 2700++ requires MASSIVE voltage to stabilize the IMC. I don't think the heat tradeoff seemed worth it. I think it needed over 1.45v to the IMC when the ram was over 1200mhz.

after doing some research i decided to try tighter timings @ cas4 ddr2-1000. it is VERY stable now at 4-5-4-12-22 1000mhz with 2.0v. I don't really trust benchmarks, but does anyone know if AMD performs better at cas4 ddr2-1000 or cas5-1200? Probably depends on what the CPU is being used for?

CPU @ 3.75 1.4v
CPU-NB 2750mhz 1.35v
NB + .2v
SB + .2v

[GSKILL TECH]

Yes, you are either hitting the motherboard or CPU max, maybe both. The memory is easily capable of DDR2-1333 if the motherboard/cpu can support it.

CAS 4 will most likely be faster, especially since it lowers the stress on the IMC. For this reason, we always recommend lower frequency and timings for AMD.

Thank you
GSKILL TECH