Geil Overclock

Mark403 · 21 Feb 2007 at 19:28

I have :-

GeIL 2GB (2x1GB) PC6400C4 800MHz Ultra Low Latency DDR2 Dual Channel Kit
EVGA 680i Motherboard

Now i understand this Ram runs at 800mhz frquency.

now in the bios i can change the DDR frequency (actual frequency = DDR / 2).

When adjusting this setting it increses the frequency shown in CPU-Z, so a DDR frequency of 900 is 450mhz frequency in CPU-z.

the max DDR frequency available in the bios is 1400, this would give a 700mhz frequency in CPU-z.

my question is, how do you get to the 800mhz frequency (1600 ddr frequency in bios) ? ??

is the 800mhz shown in the Bios (400mhz in cpu-z) correct for the ram, or am I indeed supposed to get it to 1600 in bios (800 in cpu-z) ??

thanks

Mark403 · 21 Feb 2007 at 19:35

OK, i think ive just made 800mhz memory run at 900mhz, i think CPU-z isjust displaying it wrong or im reading it wrongly (the bios is the correct clock but CPU is the DDR / 2 value).

I say this becasue 3Dmark06 says im running ram at 900mhz.

DBT85 · 21 Feb 2007 at 20:13

if im understanding you correctly, you want to run your 800mhz (so 400mhz really) sticks at 1600 (so 800 really). i dont think there is any DDRII ram that will run that high. some people i tihnk have managed to get 1.1ghz (so 550mhz) out of those geil sticks but no one ever has gotten 1.6ghz out of any DDRII i dont think.

ubern00b · 21 Feb 2007 at 20:15

I think he is refering to ddr2 so 400mhz x 2 = 800mhz. so 450mhz is an effective clock of 900mhz.

DBT85 · 21 Feb 2007 at 22:00

ubern00b said:
I think he is refering to ddr2 so 400mhz x 2 = 800mhz. so 450mhz is an effective clock of 900mhz.

he is refering to that yes, but he posed the question

Mark403 said:
How do you get to the 800mhz frequency (1600 ddr frequency in bios) ? ??

which as far as i am aware just isnt possible with DDRII ram.

Mark403 · 21 Feb 2007 at 22:11

yeh i was reading it wrong, on my Bios the the CPU clock of 200mhz is displayed as 800mhz (QUAD data Rate)

using the the same reasoning with the ram, i thought the 800mhz displayed was only 400mhz (DOUBLE data rate), but 800mhz shown was actually what the ram is supposed to run at.

esoteric · 22 Feb 2007 at 22:15

Mark403 said:
but 800mhz shown was actually what the ram is supposed to run at.

Ive set mine too 800Mhz manually after seeing in CPU-Z that its running at 368MHz, I also set the voltage to 2.1v and CPU-Z still displays its running at 368MHz, I dont understand this memory stuff, and the overclocking of ram is another grey area >_<

Anyone got time for a detailed explanation? or a link to a good guide?