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Radeon holding back OC

L

LstBrunnenG

Supreme [H]ardness
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Jun 3, 2003
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I was in the guts of my box, trying to get it to run cooler, when I decided I'd renew my OCing efforts. Just for the frell of it I decided to up my AGP/PCI ratio to whatever is one step up from 33.3/66.6. Now normally when I tried to OC it to anything > than 255 FSB it wouldn't even boot into XP. I set the AGP bus up and BAM it boots in at 260 FSB. Ran just fine until I tried to Prime it, but hey, before it would lock up before it could put up the XP boot screen.

Then I couldn't get it to get into XP at 262, but I wanted 3.4, even if it wouldn't stand up to a Prime95 test, so I decided to try and reseat the cooler on my 9800 Pro. I applied some AS3 and put it back on, and then BAM it boots in at 262.

What am I to make of all this?

So far it looks like she'll be stable at 254, and I had to tiptoe around it to make it stable at 250. Is there anything I can do to lower the FSB of prime stability? I already have a Zhalman on my CPU and a Tiger on my chipset. Would a new VPU cooler help?

Holy shoot I just walked in on it and it was doing two instances of prime at 42 degrees celsius. Right now I think my VCore is 6.2500 (it crashed prime when it was 6.5000). RAM is on a 5:4 divider. Oh and I know I'm not RAM limited cause I had my paws on some Kingston HyperX PC-3500 at one point and it would do the exact same thing. So...

3.6 or bust guys! Help me out here!
 
Never heard of a Radeon being finicky at 260 FSB, but I know they don't tolerate out-of-spec AGP/PCI ratios very well.
 
I assumed as much - so one would think that OCing the bus would hurt it, not help it, like it did.
 
maybe the PSU is limiting your overclock, I wouldn't be surprised with a 380 watt power supply and such overclocks....
 
Hmmm...interesting idea...I never notice voltage problems...has anyone had any examples of this happening? I mean, it's an Antec power supply. Aren't they like teh greatest?
 
Antec's are good, not the best though. But it shouldn't be causing you problems, a quality 380 is plenty for overclocking any normal system. Now if you start adding tons of drives etc then maybe more would be needed but your specs should be fine. I would still suspect the RAM though, any CH-5 chips can cap out far below spec when using dividers on an Intel dual channel system.

Example with my IS7

Mushkin Black PC3200 using CH-5 wouldn't allow an overclock past 267 FSB using 3:2 memory ratio. And this took a LOT of tweaking. Same results using two different sets of this memory btw.

Corsair PC3200LL using CH-5's wouldn't work at all using 3:2 ratio, and were so much crap to get working at anything other than 100% stock and very mild 1:1 overclocking that I'm still disgusted with them. Had these two days and returned them.

Kingston HyperX PC3500 using BH-5 let me get a little past that, but not much. It was much less problematic, but I only borrowed this a few weeks and did not spend a long time tweaking it out.

OCZ PC4200 EL using Hynix chips slightly annoyed me by not working at spec past 264 FSB 1:1, rather than the rated 267. BUT itis allowing me to hit 3.4 with my P4 using ratios. I've only had it two days and am still tweaking and switching back and forth 3:2 and 5:4 and finding out what timings I can get. Actually I'm not even positive that I've topped out my chip. When I got this stuff I thought my top was very near 3.2. :D

Disclaimer: I've heard of problems with anything but 1:1 using older revision Hynix chips.
 
Gah it seems silly for me to spend that kind of money to get 200 more mhz, when I could better spend my time tweaking out my 3.25 OC to make it more stable. I'm better off saving for my next system. That way I can buy everything new - ATI's (or NVidia's if they make a sudden comeback) hottest new PCI Express video card, the best OCer out of the Prescotts, a terabyte or two of RAM, An array of at least 4 500 GB 15,000 RPM HDs in raid 0....

Come on, in a year and six months, it could happen!
 
Ive had success with getting a few more mhz out of p4 c chips sometimes by running at a lower voltage then I thought was proper for a certain overclock ...also , ram could still be a factor unless you can get a hold of some bh-5 stuff or pc4200 stuff for uninhibitted ratio action or straight out 1:1 action ..

..then again it could be your psu as stated ..I've had an antec psu that didnt like running more volts to agp then stock , otherwise d3d games would lock up on an asus mobo I had ..it was a 550wtt'r too.

..or you just got a chip that just aint gonna do you any more favors and give you anymore speed no matter what you do.

I never had a problem with 9800's under 303mhz fsb
 
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