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Crucial PC2100 DDR RAM Overclocking

H

Hessakia

Senior member
How far would the aforementioned PC2100 Crucial CL2.5 memory overclock too in case i get an XP 1600+?

Hessakia
 
I've seen reviews where it ran solid and stable at 166mhz without a heat spreader, but I never ran mine higher than 155mhz though I'm certain it could have done it.
 
I could never get mine past 305Mhz. It would error out in Memtest86. To be fair, it was 2 x 512MB sticks of Crucial, but it had Infineon chips on it, not Micron.
 
Can you smoke the Crucial stuff by pushing the FSB up too high or is this solely from people who juice the memory voltage?
 
Someone answer the man's question. 😉

Seriously though, I'm about to do some of my own O/C'ing, and I have the exact same RAM. Has anyone actually determined whether bumping up the memory voltage actually makes a difference?
 
Mine was stable at 166mhz and SPD and 2.7v for a few months before I sold it to buy higher stuff..that person is still running it at 166mhz and has nop problems
 
I have used 2 different Crucial PC2100 sticks. Both ran 166MHz at cas 2 with slightly relaxed timings. I mercilessly gave both of them 2.9v and they are still running strong today.
 
I guess I got lucky because I have two sticks of 256 megs.... they are rock stable at 166, max aggressive timings. Oddly enough, any higher and they're not stable at all, even if I relax the timings.

As for voltage, I have always fed them 2.8 volts... recently I tried giving them 2.9 for a day just to see if they would fry or anything (stupid I know) but they were fine. I don't have heat spreaders or anything... I do have decent case ventilation though. I let 3dMark 2001 loop for a while, after I started giving them 2.9 volts, and touched 'em with my hand every now and then... and they were warm to the touch, but not hot.

I recommend to anyone, whether overclocking your ram or not, to give it more voltage... 2.7 to 2.8.
 
i have 2 sticks of crucial 256 that will run 166 cas2 at 2.7volts with thermaltake heatspreaders, micron chips
 
Wow, thanks for all the feedback! The reason I ask is that my original 256MB stick got partially fried and was being detected as only 128MB. I was running at 150FSB with 2.7 volts and it didn't feel hot to the touch. Crucial was great about replacing it but I do have a word of caution about cross shipping with them. The replacement stick is invoiced to you as if you were buying it with taxes, shipping and all that good stuff on top. Once Crucial confirms receipt of the "defective" stick then they credit your VISA for the cost plus tax only. Here is the rub... I live in Canada and got dinged for duty, return shipping, handling and lost on the exchange rate.
 
Well, any other results?
my 1600+ from newegg should be here soon, and i'm curious what luck yall have had so maybe i could get mine running at 10.5 x 164 or so to give me 1720mhz
I"m usuing an AX7 with a 48.5cfm YS Tech fan, so i shouldn't be hoping too much.

Hess
 
Hessakia, here are the numbers I've been getting with my Crucial memory on an Abit KR7A (all have passed several hours of prime95, as well as some 3D gaming):

2.5-2-6-2 @ 2T with 4-bank interleave up to 184FSB (9.5m)

2-2-6-2 @ 2T with 4-bank interleave up to 174FSB (10m)

2-2-5-2 @ 2T with 4-bank interleave up to 166FSB(10.5m)

I run it at 2.5-2-6-2 @ 2T with 4-bank interleave at 180 x 10 (1.8GHz)

These are the stable numbers I got with 2.85V DDR, 3.65V I/O

All in all, this stick rocks! Hope that helps you some...


 
I also own 2 sticks of Crucial pc2100. I managed to get them to 150 fsb ; I managed to get windows to *start* booting at 166mhz, but received a bsod saying that some device failed to initialize. I'm a little surprised at the difference in yield for these sticks.. I've read some people getting them past 166mhz w/o any trouble, and yet some people not being able to pass 150. Any thoughts on how I might be able to be sure that my ram is the limiting factor here? I'm running a Duron 800 with an Epox 8k7a. I unlocked my duron and have tried 5.5x166 = 913. But as with the person who wrote the first post here, I'm interested in seeing how good the pc2100 can go because I'm also considering buying a 1600+.

By the way, the epox 8k7a supposedly has a 1/5 pci divider so i don't think it's my pci devices that "failed to initialize."
 
Originally posted by: Hessakia
...maybe i could get mine running at 10.5 x 164 or so to give me 1720mhz...
Click to expand...

:Q 10.5x164!! Damn I've got mine running 10.5x153....i've been running SETI for awhile and haven't had any problems, but I never thought about pushing it to 164 :Q

 
Does anyone know the difference in the micron crucial chips. Some say 75 B on it like mine and others say 75 A. I know the 75 means 7.5ns
 
I'm running Crucial PC2100 memory @ 166 MHz DDR (333), and have been for more than half a year with ZERO instability. This is also at the default voltage.

In the BIOS, I have it set to 2-2-2-5-7, however I have since found out that my ASUS P4B266 runs any memory over 133MHz DDR @ 3-3-3 (and it would be weird that I could achieve PC2700 memory speeds with the most agressive timings out of CL 2.5 PC2100 memory at the default voltage, after all...).
 
I have 2 - 256mb cruical ddr266's running stable at ddr 354 on a asus p4b533 right now. I used these 2 same sticks on a MSI sis 645dx motherboard and got up to 390 ddr 100% stable :Q . I left the timings alone because changing them made windows not start up. I leave the voltage at 2.5V.
 
I was bored and though I would look through the boards for topics that would enlighten me on overclocking.

I was wondering, I use 2 sticks of 512MB Corsair PC-2100 Cas 2.5 also (on an Abit KR7A) and I would like to push my FSB as I have not unlocked my XP 2000+. My question is, I can up the FSB but should I do anything about the voltage? (New to this as you can see) Can someone explain to me how this works? Thanks a lot.

Also, where could I pick up this Prime95 you guys talk about?
 
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