Wrong speed

CaseyChaos · 10 Dec 2008 at 04:02

I have 2x2gb of corsair value 667mhz pc5300 in a shuttle sg33g5, no matter what i set the bios to cpu-z says that im running the ram at 4:5 ratio, i have my fsb at 334mhz to give me 3ghz on my q6600, which cpu-z says the mem is running at 418mhz, ive had one bsod in the past 2months and one lock up lately while playing need for speed undercover, is cpu-z wrong? the lowest i can set the mem to in the bios is 667mhz which gives me 836mhz, currently ive set it to 'by spd' which is still giving me the 836mhz, I can't seem to remove the 4:5 ratio so if cpu-z is right then i'm stuck

CaseyChaos · 10 Dec 2008 at 13:13

im not confused, maybe i worded it wrong, i kno that my fsb of 334 is doubled to get my ram rating of 667 which is what im trying to achieve, everything is fine apart from i can't remove the 4:5 ratio, there is no option in bios of 1:1 if i could set that I'd be fine. i was just lookin around the new cpu-z see if anything was new when i came across the problem.

CaseyChaos · 11 Dec 2008 at 01:06

yeah sure, been over the bios very carefully, no mem ratio option at all

found this on a different forum using google

With the Corsair XMS2 RAM used, "By SPD" and 667 both correspond to a 4:5 divider, while the 800 setting corresponds to a 2:3 divider. Needless to say, the lack of precise settings, and particularly a 1:1 ratio, is limiting if trying to push the performance as high as possible

does this mean I'm going to have to go out and get some new ram, 800mhz corsair xms2 is about £40 for 4gb so i guess it won't break the bank, it'll still be running at 836mhz but at least the 800mhz should be able to handle it better than 667mhz

CaseyChaos · 11 Dec 2008 at 12:13

there are only 3 options for dram frequency by spd, 667mhz and 800mhz. both by spd and 667mhz make the ram work at 4:5 ratio and give me 836mhz and the 800mhz will run at 2:3 ratio and run the ram at 1002mhz. ill just have to buy some new ram and let it run at 836mhz

CaseyChaos · 11 Dec 2008 at 14:20

helmutcheese said:
You are missing something or you have a weird Bios.

The SPD is not even used by many peeps esp OC'ers.

SPD is only Jedec's naff for setting Timings and Voltage, you need to set the Memory to Auto to follow the FSB 1:1 or manually pick a speed after setting the FSB (normally a drop down menu) of a few Speeds/Dividers inc 1:1.

if i set it to auto, it still sets it to 4:5 ratio, there are not settings for the ratio at all, just the by spd, 667mhz and 800mhz, ive said that before.

the motherboard is the one that comes with the shuttle sg33g5 whichever that is