dimapro Posted January 3, 2005 Share Posted January 3, 2005 What kind of ram do I need for it to run at full speed (400Mhz - PC3200) while I got my CPU overclocked from 2.4 ghz to 3.2 ghz. Currently I own 2x512mb modules from Costco (Simpletech brand) and when I O'C my CPU, my motherboard (Asus P4P800 deluxe) automatically picks lower speed like 320Mhz or less. If I set my RAM frequency to 400Mhz, my computer locks up and doesn't boot. I want memory that will run at least 400Mhz like it suppose to. Also is there some free software that can tell me at what frequency my ram is running? Because when I set my motherboard for auto, I have no idea what frequency my ram is at, when I O'C. Link to comment Share on other sites More sharing options...
Wired Posted January 3, 2005 Share Posted January 3, 2005 Are you manually OC'ing it or using your board's automated OC'ing features? What CPU / FSB / motherboard do you have? Also, it may be the motherboard underclocking the memory. Link to comment Share on other sites More sharing options...
jdracer47 Posted January 4, 2005 Share Posted January 4, 2005 The memory speed in your Bios has nothing to do with the actual speed the memory is working at. This is one thing I hate about the Asus Bios. 400 is actually a 1:1 ratio. In other words, if you have it set at 320 it is running at 5:4 ratio. Your processor is at 266 FSB and your Ram is at 213 MHZ or DDR 426. A slight over clock of your Ram. This is a good thing. If you want to run it 400 or 1:1, you want to get ram to match your overclocked FSB like DDR 533. Download SiSoft Sandra or CPU-z to get exact speeds of what everything is working at. I have been a noob with a P4P800 Deluxe too (that was my old board), and you are not alone. :biggrin: Overclocking DDR 400 to DDR 533 can be done with a lot of Juice, but I wouldn't recommend it, and I doubt an non-voltmodded P4P800 would be able to supply enough voltage to both the Processor and Ram to run it stable. Link to comment Share on other sites More sharing options...
dimapro Posted January 4, 2005 Author Share Posted January 4, 2005 I have 2.4c CPU 800Mhz FSB. I downloaded z-cpu utility yesterday and it shows that my memory is running 175Mhz with 3:2 ratio. I got P4P800 deluxe, it has auto OC, I set FSB to 263 I have everything else on auto. When computer boots, the screen shows that I am running my ram at 266Mhz. But it's not 266, If you divide 263 by 3 and mulitply by 2, it comes out 175, which is what z-cpu shows I am running at. Now my question is: if I want to run my RAM at syncronous speed 1:1 I guess that means I need ram that can run 263 x 2 = 526Mhz or more. :): Are you manually OC'ing it or using your board's automated OC'ing features? What CPU / FSB / motherboard do you have? Also, it may be the motherboard underclocking the memory. Link to comment Share on other sites More sharing options...
jdracer47 Posted January 4, 2005 Share Posted January 4, 2005 What you said is correct. However, you may not be able to hit 266 stable with the ram at DDR 533 stable. If you want to save some $, try not using the auto overclock features (they are unreliable anyway), and manually set the CPU to 250-266 (wherever it was stable) and set the Ram to 320 not Auto. This will force the ram to operate 5:4 and not 3:2. That 266 it is setting it to is actually a 3:2 divider, why Asus doesn't just put in the ratios I have no idea. The Bios is pretty friendly except for that one annoying feature. Using 5:4 is not a bad thing, there is much debate whether 1:1 operates better than 5:4, and I would try it before spending a lot on DDR 533 when you might not be able to hit 266 stable anyway. Hitting 266 with the processor is one thing, hitting it at 1:1 with the ram isn't easy. BTW, whenever I OCed my Asus board and left the memory set to auto, it always set it to 266 or a 3:2 divider. It's like it runs home to mommy or something. Link to comment Share on other sites More sharing options...
Yellowbeard Posted January 5, 2005 Share Posted January 5, 2005 Now my question is: if I want to run my RAM at syncronous speed 1:1 I guess that means I need ram that can run 263 x 2 = 526Mhz or more. The PC4400C2.5 would be fantastic RAM for what you are trying to do. Mike. Link to comment Share on other sites More sharing options...
jdracer47 Posted January 6, 2005 Share Posted January 6, 2005 Ahhhhh, there is Mike disagreeing with me again lol. Mike HAS been doing this longer so you might want to listen to him. This is why PCs are so much fun, so many opinions, techniques, and new horizons. I just keep tweaking until I find that ultimate setup (then they come out with something new of course). Link to comment Share on other sites More sharing options...
Yellowbeard Posted January 6, 2005 Share Posted January 6, 2005 Ahhhhh, there is Mike disagreeing with me again lol. Mike HAS been doing this longer so you might want to listen to him. This is why PCs are so much fun, so many opinions, techniques, and new horizons. I just keep tweaking until I find that ultimate setup (then they come out with something new of course). Not really disagreeing with you JD, everything you said above was spot on. My point about the PC4400C2.5 is that it is very flexible RAM. It is made with the Samsung TCCD ICs which are a good bit more tweakable than the other stuff made with the Hynix ICs. So, if your prediction above is correct about the speed potential of the MOBO, the user can "probably" tighten the timings some on the RAM if he is not able to hit a full 275mhz. Most likely, as you indicated, either the CPU or the MOBO will limit his OC. With the PC4400, he probably won't top out the RAM. And, all of this is just my opinion ;): It will be outdated and/or irrelevant very soon as the technology changes yet again. Mike. Link to comment Share on other sites More sharing options...
dimapro Posted January 7, 2005 Author Share Posted January 7, 2005 Thanks very much for your info. This helps a lot. I will go home tonight and change the setting from auto (266) to 320Mhz. What I was able to archive, since I didn't know I can run faster then 175Mhz (DDR350) was lower the latency timing. Originally my ram was at 2.5-3-3-6. I was able to lower it to 2-3-3-5, which bumped few frames up in HL2. Now I predict if 5:4 setting works, I should get even better score, although I will have to go back to original settings. BTW, I was using Z-CPU. You didn't see my other post. The memory speed in your Bios has nothing to do with the actual speed the memory is working at. This is one thing I hate about the Asus Bios. 400 is actually a 1:1 ratio. In other words, if you have it set at 320 it is running at 5:4 ratio. Your processor is at 266 FSB and your Ram is at 213 MHZ or DDR 426. A slight over clock of your Ram. This is a good thing. If you want to run it 400 or 1:1, you want to get ram to match your overclocked FSB like DDR 533. Download SiSoft Sandra or CPU-z to get exact speeds of what everything is working at. I have been a noob with a P4P800 Deluxe too (that was my old board), and you are not alone. :biggrin: Overclocking DDR 400 to DDR 533 can be done with a lot of Juice, but I wouldn't recommend it, and I doubt an non-voltmodded P4P800 would be able to supply enough voltage to both the Processor and Ram to run it stable. Link to comment Share on other sites More sharing options...
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