Yeah, I know its dated. Still, I have seen numerous people running at 190 or 200mhz fsb on a KR7A. Well, I just got some new ram yesterday, so I figured I would be looking at atleast 180.. Dident exactly happen that way.
Better start at the beginning and list my current system specs.
1700+ JIUHB 0310 DUT3C
Abit KR7A-Raid (the one with the two dark caps and yellow raid)
512mb Infinion PC2700
ELSA GeForce3 "classic"
20gb Quantum Fireball 7200rpm hdd
12gb Quantum Fireball 5400rpm hdd
L&C generic style 300W PSU
Cooled by a Volcano 6cu+ with AS3 correctly applied and seated well on the CPU, 5 80mm fans in my case (Antec SX1200). My NB fan died yesterday while I was installing my ram, so I hung a delta 60mm over it the northbridge as a temporary fix.
What I have done: Well, the rig does 166 fsb with nice timings (2-3-6-3-1 @ 2.75vmem) no problem. 100% stable, and runs at about 34C cpu temp, 21C mobo at that (1.83ghz).
Now, I figured this was just the beginning of the fun and up the fsb to 175. It booted into windows 2000 pro sp3 no problem, and proceeded to promptly reboot when I tried running sandra. At this point I wondered about the ram and dropped the timings to 2.5-3-6-3-2 and upped the voltage to 2.85vmem. Tried again. Exactly the same thing.
Ok, so its not the RAM. I drop the fsb to 170, and its 3dmark2001se, quake3, vietcong etc stable. with no overvoltage (except mem at 2.75v) and nice timings. Now I work my way up to 173 fsb and it Â§Â§Â§Â§s out after a few mins of gaming. Check my temps, and they are around 36C/21C after the crash (in bios).
Now, I thought it was too high a PCI bus (173=43mhz, 174=44mhz). I pulled my two PCI cards and disabled the serial ports, parallel port, fdd controller etc in BIOS. With both the network card and sound card removed I tried 174mhz and got the exact same thing.. Huge 3d artifacts in Quake3 and a hardlock a couple mins later.
I've tried turning off AGP fast writes, running 2x etc and upping the VIO to 3.65. My northbridge heatsink is just barely warm with a 60mm delta blowing on it.
So I backed off, and went down to 172fsb. Now, I completed about 25mins of BURNK7 with no problem. After a half hour or so of burnk7, in my experience, a system crashes if its going to. Now, I pronounced this stable and closed burnk7 to go online for a few mins before I started working for 173. 5 mins into my web browsing and the system restarts.
Hmm ok, so 172 ISENT stable. I backed down to 170, ran burnk7 for an hour with no problems. Fired up winamp and opera and sat back.. started loading a webpage and opera gives me a fatal error, instantly hardlocking the system (not just a reboot). Now, my temps where around 34C cpu and 21C mobo all this time. 168 is very stable, and I've been running burnk7 for around 6 hours now.
I'm running out of ideas guys. I was really hoping for atleast 180 fsb, but it looks like I wont even get 175. What am I doing wrong? I know oppainter, ddtung and mricee (for all of you who I have not mentioned, my sincere appologies, these are just the names that come to mind off the icrontic thread I stumbled across last night looking for info) have run the KR7A at fsbs exceeding 190mhz. HOW??
I think my problem may be my power supply, because my voltages are a little on the low side (I upped my vcore to 1.675 from 1.6 for stabilities sake, btw). My 3.3+ is at 3.60, 5+ is at 4.70 and the 12+ is 12.22. Standby voltage is 4.73.. these are fairly stable, but dip or rise on occasion (12v and 5v).
I'm going to try and get ahold of a new PSU in the near future, but as always $ are sparce so it would be great if I could get somewhere with this one if at all possible.
What do you guys think? Give up and buy a new motherboard? Whats the best way to get to atleast 180 fsb? Sorry about the length, and thank you VERY much in advance for your replies