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Ok, I've been running my cpu at a FSB of 220MHz for a while now. It's rock stable. But I've never been able to reach 225MHz at a stable state (I can reach the desktop but when I run 30Mark05 it ALWAYS crashes when entering in the very last test... always at the same place). I first thought it was my crappy PSU or my too high temp (which was at 60 celcius idle) so I've ordered a OCZ Powerstream 420W and a Zalman 7700 copper with a tube of AS5. I got rock stable voltage (vcore is at 1.34V), I got a 9 degrees instant temperature drop (cpu temp) but when I put my FSB at 225MHz it STILL CRASHES JUST BEFORE ENTERING IN THE LAST 3DMARK05 TEST!!!! I'm really depressed now... plz help me solve my problem! Plz! I paid like 300 bucks to reach higher than 220MHz jesus crist! Plz help!
BTW : my memory timings are 2.5-3-3-8

First things first...What CPU and motherboard are you using?
Also what type of Ram do you have?
It will be alot easier to help you reach a higher FSB if we know exactly what you are using in your setup.Sempron 2400+ OCed to 2.2GHZ
Abit NF7-S2
1 GB PC3200 Ram
Thermaltake T2-M4 HSF
rmackie@microtailors.com
www.microtailors.com

- P4 Prescott 3.2 @ 3.52 (Socket 775),
- 2 stick of 512Mo 3200 @ 3520 in dual channel (mushkin)
- Chaintech 6600GT
- WD SATA Hard drive (200Go)
- Chaintech Zenith V915P.

ur really pushing it ...but try to raise ur v-core...the higher ur vcore the higher you can raise your fsb and keep it stable. It will raise the cpu temo by raising vcore..butt hat is the price to pay is you want to rais the fsb.

Try dropping the cas to 3 not 2.5
Tt Lanfire
nf7-s v2.0
XP-m 2500@209x11
SP 97
512mb pc3200
Jou Jye 550w psu
FX5600
WDCaviar 160gb sata
WDCaviar 160gb sata;~}

"I paid like 300 bucks to reach higher than 220MHz"
LOL! LMAO! Are you saying that if you got the FSB up to 225MHz it would have been a worthwhile investment?
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4800SE 128MB
WinME/WinXP Pro

sounds like you're trying to OC while keeping your ram at 1:1. I think going above 220 fsb with 1:1 ddr400 ram is a little harsh for your ram. Either change the memory divider to 5:4 (320 mhz) in bios...this will run your memory slower than the fsb so you can go higher (as well as tighten your timings)...or get faster ram that you can run 1:1 (ie: PC4000/DDR500...it's rated for a 250 fsb).
I've been playing around with my p4 3.0 ghz northwood (the prescott's run hotter, so that probably would limit your oc options). the CPU can go up to 280ish fsb (I used the 266/3:2 fsb:ram divider to slow down my memory as much as possible), so I know my weakness is my memory. I can run 250 fsb with the 5:4 fsb:ram divider, but I get the same performance with a 225 fsb at 1:1 timing. The funny thing is my ram used to not let me go past 210 with 1:1, but I guess all my small oc'ing tests gave it a burn in or something.
Remember, alot of instability comes from ram issues, and you seem to be trying to force your ram hard because you're only looking at the cpu. Sounds like you're willing to pay whatever it takes, so I'd get PC4000/DDR500 ram.
There are other issues to think about as well. I'm not sure if a 420W PSU is good enough for your setup (I used to have a 420W PSU, but when I counted up all my drives (cd, dvd, hard drive, etc), video card, etc...my system needed a 480W+ PSU (ie: at boot up, when all your drives start spinning up, etc...it takes alot of power). Also, depending on the PSU's quality, it might not be giving you a clean signal, or it might be under/over volting.
The motherboard might have issues as well. For example, my mobo (asus p4p800) is known to overvolt (gives more power than specified, and certain vcore settings don't actually change anything). It also has a droop problem (under full load, the vcore drops down, which would make overclock's unstable and possibly crash since they need the higher voltage).
Or perhaps you just have a dud cpu that's a bad overclocker. In a batch of cpu's from the factory, few will be good for overclock, another few bad for overclock, and the rest are just average. One way to test this is to do what I did above (slow your ram as much as possible, and look for the highest fsb you can get). In my case, I could get like 284 fsb, which would mean I'd have to get DDR560+ ram if I wanted to run it at 284 fsb 1:1....but then I'd need to go for watercooling. In that way, you'll know your CPU's limit.
Or, you can try getting heat spreaders for your ram chips. That'll let you overclock them a little more. (I just remembered...my ram is probably letting me run at 225 fsb instead of the former 210 fsb since I rigged a case fan inside my case to blow on my ram chips. They don't have heat spreaders...I wanted an active ram cooler, not a passive one lol.

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