2x512MB KHX BH5 IN A DFI LP UT...questions.

[EnJoY]

Ok I just got my new KHX 3500 BH5 (2x512MB) in and it's running like a champ in my DFI LanParty UT 250GB with 2 nice 40mm's and thermaltake copper heatsinks on each of the chips. They do 260mhz at 3.3volts 2-2-2-5 in memtest without issue and such, however my cpu currently sucks so I'm getting a 3400+ Mobile to replace it so I can go higher and get some nice benches.

Anyhow...in the bios I have all the timings tweaked really well. They've been tested in A64 tweaker and Memtested and they seem to be the perfect and fastest timings for my ram (I get 97% efficiency in sandra at 2.2ghz). However I've never been able to tweak any of the settings below the timings in the bios...such as drive strength and such. I've heard and can help stability with 512mb modules at higher speeds so I'm a bit eager to adjust them. ;) Basically I'd just like to know what you guys with similar ram the this motherboard set those settings to. Thanks in advance.

[eva2000]

totally depends on ram, never used KHX3500 BH-5 and it does act differently from KHX3200 BH-5 but drive strength 1 or 2 is used for me with some ram

i leave skew and stuff alone anyway

[EnJoY]

Ok thanks, what does it do exactly?

And what about the other settings?

[eva2000]

drive means allows certain ram to overclock better that's all i know read http://i4memory.com/showthread.php?t=142

[Trixxy]

the 3 settings that I found made a difference when using 2x512 BH5 (3.4v) are:

*Read to Write delay(tRTW)*= 2 (I use 1 with one stick)
*DQS Skew Value*= 128 (I use 64 with one stick)
DRAM Drive Strength**= level 2 (I use 1 with one stick)

here's all my bios timings:

**Dram Frequency Set(Mhz)**= 200(Mhz)
**Command Per Clock(CPC)**= Enable(1T)
*Cas Latency Control(tCL)**= 2
**RAS# to CAS# delay(tRCD)**= 2
*Min RAS# active timing(tRAS)*= 10
**Row Precharge timing(tRP)**= 2
**Row Cycle Time(tRC)**= 8
**Row Refresh cyc time(tRFC)**= 12
*Row to Row Delay(tRRD)*= 2
*Write Recovery Time(tWR)*= 2
*Write to read Delay(tWTR)*= 1
*Read to Write delay(tRTW)*= 2
**Refresh Period(tREF)**= 1168
Write CAS# Latency(tWCL)**= AUTO


*DQS skew Control*= increase skew
*DQS Skew Value*= 128
DRAM Drive Strength**= level 2
*Max Asynce lantency**= 8ns
*Read Preamble time*= 5ns
*Idle Cycle Limit*= 16cycles
*Dynamic Counter*= enable
*R/W Queue Bypass*= 8x
*Bypass Max*= 4x
*32 byte Granulation= disable

there are a few improvements that can be made there, still have some testing to do. :)

the above settings are good for 260+Mhz with 2 sticks - still to test higher, and 267Mhz with 1 (I seem to hit a strange wall at 267, not sure why - increasing vdimm by .4v did nothing).

[EnJoY]

Your post was just what I was looking for Trixxy. Thanks a lot.

[eva2000]

each BH-5 ram can be different trust me i've tested like 40+ sticks of the goodness ram hehe

[EnJoY]

yea I've been grabbing up a bunch of different sets of BH5 in 2x512MB form to test and these KHX I have now have shown to be the best. They did 225mhz at 2.8volts. :) Not bad for double sided BH5. :)

[situman]

Please lets not try to make BH-5 expensive again.