Hi, I just bought a pair of corsair xms twinx 512mb pc2700 memory and i can't seem to overclock it. I am new to overclocking but have read alot of articles on the net. Anybody that can guide me a little on how to overclock this bad boy? its running at 266mhz, isn't it suppose to run at 333mhz since its a pc2700? my mobo is GA-8IR533 Gigabyte mother board runing with a Intel Pentium 4 2.2ghz Procesor. In my bios i dont see anything for changing memory timmings can anybody help me out here? thanx
Hi, Your mobo supports only 200DDR and 266DDR memory speeds, which would be selected to be synchronous with the Pentium FSB your CPU uses. 400FSB would therefore use 200DDR memory, and 533FSB would use 266DDR (PC2100). But it's good you bought the name-brand PC2700! Instead of trying to increase your memory to the 333DDR, run it at PC2100 speed but with aggressive memory timings. Because it is rated for higher speed it will support these timings wonderfully (maybe even in its SPD) at the lower speed :^) I'm assuming your Pentium4 runs 533FSB...? Some mobos have lots of adjustment for both memory speed and memory timing settings in their BIOS - some have only one (or neither). Hope you are able to lean on the timings, even if your mobo won't support the asynchronous FSB/memory operation. Let us know if you have memory timings adjustment. Do you have a mobo manual? Here is a link for your info http://www.shentech.com/gigai853ddat.html But the link given for Gigabyte seems to have gone dead... L8R
Hi thanx for helping me out, the only thing i see in the bios regarding memory would be this: Frequency/voltage control Cpu host frequency [disabled] Cpu host Frequency (mhz) 133 fixed pci/agp frequency 33/66 Host/dram clock ratio auto Memory Frequency (mhz) 266 PCI/AGP Frequency (mhz) 33/66 Is there hope or do i need to get myself a better mobo? if so what do you think about the Abit IC7-MAX3? and if i get that can i run the same memory i got on that bad boy and get some blazing speeds? thanx
Your CPU and mobo and memory are 'matched'. To get a new mobo, most run PC3200 memory - so you would want a new mobo, new CPU with 200FSB (800QDR) and new memory: basically a new computer :^( This is where the memory speed is set, as a ratio to what the FSB (which is 'fixed') is running. On most mobos the ratios describe multiples of PCI frequency which is 33MHz, in other words my PC runs 6:6 ratio (200MHz FSB : 200MHz memory (which is 400DDR, both). You might see this as 400:400 or 1:1 but technically it is 200:200 (which is 33 x 6) so they (ABit) properly refer to it as 6:6. Running 166FSB CPU with 400DDR (PC3200) memory would be 5:6 ratio, asynchronous. This is what I get on 'auto' but it is NOT the hot setup. The memory and FSB should be synchronous if possible - this is the advice I have given you. Intel does things a little different with P4. The FSB is quad-data-rate (QDR) not DDR like the DDR memory (and AMD FSB). Intel runs 100 (400QDR), 133 (533QDR) and then they jump right to 200 (800QDR). 166FSB (which would be 666QDR) is not represented. Your mobo, therefore, is not setup for synchronous 166 (333DDR = PC2700) operation, as there is no Intel P4 CPU running this FSB speed, capish? Your ratio would be properly expressed as 4:4 (533QDR:266DDR). To increase the memory clock to 333DDR, you would require 4:5 ratio. If it is not offered, don't worry - run the memory synchronously, and like I said you can push the timings (if they can be manipulated in BIOS - some BIOS will automatically use only SPD settings retrieved from the SPD chip on the memory stick). Brand-name Corsair memory will offer better timings at PC2100 speed (you) vs. PC2700 speed. So, if you were able to increase the memory clock speed, your timings would grow longer (bad)! Just run it - it will be stable & reliable, and as fast as it's gonna get :^) Be happy... Hope this helps, L8R
Hi man thanx for clearing those things up. Im thinking of getting rid that mobo that i was telling you about but i got a question, can i use the same video card for the new mobo? I got a radeon 7000/VE Family video card would this work on that mobo? and im guessing my Intel 2.27 Pentium 4 Intel 8 kilobyte primary memory cache 512 kilobyte secondary memory cache processor will work on it as well right? Thanx. BTW: Is there any newbie guide on learning the memory timmings?
