Unable to set CAS-timing over 6 (on GA-P35-D3SP)

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bjarke15

bjarke15

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Jun 4, 2013
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I'm trying to get four sticks of DDR2 Kingston HyperX (KHX8500AD2/2G) running at advertised spec on my old trusty Gigabyte GA-P35-D3SP. By default, they run at 800Mhz with a timing of 6-6-6-18 at 1.8V while they are advertised for 1066Mhz with a timing of 7-7-7-20 at 2.0V.

Apparently, BIOS (latest revision) doesn't allow me to set CAS any higher than 6, but I can set everything else just fine. Running with 6-7-7-20 and 2.0V at 1066MHz (444MHz FSB, 2.4x multiplier) does not seem stable, as it often fails to boot properly (BSODs, boot loops & whatnot). I've also overvolted the CPU (E5472) a bit to make sure it's handling the increased FSB.

If any of you guys know some voodoo for increasing the CAS timing (maybe BIOS unlock), I would be grateful to hear it. I don't think it has anything to do with the LGA 775 board rocking a LGA 771 chip, but please enlighten me if that could be an issue.
 
Solution
RememberThe5th
Try to push ram up to 2.1V but if you have heatsink.
Disable all EIST and that stuff.
Well i pushed my SB and NB +0.4 V (or just NB?).

Well on my "Cheap ghetto" board (G31M-S2L) ive managed to pull 1066 with ratio 2 but at lower clock speed (mine is 800 your 1066 actual rated).
First im gonna suggest you, try to overclock CPU and find upper limit (not limit limit, but limit of FSB) after that you can see how ram can go high (and motherboard limit of course) , test with intel burn test (10 passes), but i don't know how good cooling is on your motherboard, mine was hitting 90*C+ at 1458FSB (rated not sure which ratio as i don't have pictures anymore) and 3GHz (Q6600).

Sometimes the PCIE if its set to auto can cause troubles.

As for...
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RememberThe5th

RememberThe5th

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Jul 30, 2014
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I know that on mine OCZ Nvidia SLI ready i can bump from 800MHz to 1066MHz with 6-6-6-18 at 2.2V but that requires NB and SB to push 0.1V or 0.2V (if it gets hotter aaand thats upper limit of my board). If you haven't changed thermal paste (pads, not sure what is used for south bridge-SB and NB). They get very old and crisp. i used nail polish to cover resistors (tried not to short them with thermal paste).
Oh and hello again.
 
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bjarke15

bjarke15

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Jun 4, 2013
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We meet again Robert! Upping FSB voltage +0.2V and MCH +0.15 V (under active cooling of NB and SB) doesn't seem to produce stability at 444MHz FSB and a 2.4 DRAM ratio (1066MHz). MemTest gives errors instantly. This is the case at 6-6-6-18 as well as at 6-7-7-20. Lowering the DRAM ratio to 2.0 (888MHz) at the same FSB freq. has given no errors thus far. This might indicate that the NB is able to handle the increased FSB while the RAM cannot handle 1066MHz - at least not with current timings. Maybe it has something to do with the previously encountered fiddly RAM compatibility on the Xeon.

Could upping the DIMM voltage 0.1V over spec help or should I try my hand at a 533MHz FSB with a 2.0 ratio to achieve 1066MHz?

Update: 400MHz FSB and 2.4 ratio (960MHz) seemed stable in memtest, but failed once to reboot from BIOS and reverted to stock ratio.
 
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RememberThe5th

RememberThe5th

Illustrious
Jul 30, 2014
6,996
172
41,140
Try to push ram up to 2.1V but if you have heatsink.
Disable all EIST and that stuff.
Well i pushed my SB and NB +0.4 V (or just NB?).

Well on my "Cheap ghetto" board (G31M-S2L) ive managed to pull 1066 with ratio 2 but at lower clock speed (mine is 800 your 1066 actual rated).
First im gonna suggest you, try to overclock CPU and find upper limit (not limit limit, but limit of FSB) after that you can see how ram can go high (and motherboard limit of course) , test with intel burn test (10 passes), but i don't know how good cooling is on your motherboard, mine was hitting 90*C+ at 1458FSB (rated not sure which ratio as i don't have pictures anymore) and 3GHz (Q6600).

Sometimes the PCIE if its set to auto can cause troubles.

As for overclocking if you bought that ram set from china, you have a bad luck, they are for example 800MHz rated, but they are actual 667MHz because they somehow flash the ram???

If you have real set, then if it has heatsink on it and active cooling then they could achieve 2.1 or 2.2V, but i know for sure that mine run at 1066MHz and 6-6-6-18 timings without trouble.


Mine is a bit trickier to overclock because gigabyte and broken bios.

This was the 1500FSB

(Oh i found them)
This is my C2Q Q6600 G0 on 1.280V (GTL Ref 0.615 or Vdrop) 3.159GHz, 350FSB, Rated 1405MHz
On Asrock G31M-S2L rev 1.0
PCIE clock 108MHz
1x2GB Nvidia SLI Ready or OCZ 5-5-5-15 1T 2.2V
(this is picture i was actually close to repeat overclock)
cinebench_slika.png
In short you have to play with settings a bit, to get known of motherboard what it likes and what it doesnt.
 
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