I working with computes since 1991 and there is not much that I cannot understand, but this MSI mobo is challenging me. So, the mobo in question is a MSI PM8M3-V with PCB rev. 1.0 and latest bios v1.4 used. Board: MSI PM8M3-V (VIA P4M800) PCV rev. 1.0 Bios: Version 1.4 VGA: PNY 6800GT 256MB DDR3 350MHz/1GHz PSU: Enermax Liberty 620W PSU (replaced caps to quality ones!) CPU: 2800MHz Celeron D 336 (133x21) 1.350Vcore MEM: 2048MB OCZP4001G 2.5-3-2-7 200MHz 2.60V HDD: 500G Western Digital 16MB cache (WD5000AAKB) COOLER: Intel box cooler, checked, AS paste applied, cooling good (slowing all the way down to 1000 rpm in reality) OC: NONE! (tried FSB 133 -> 138 and it get unstable even in Firefox, lol) OS: Windows 2000 SP4 Czech More info: 19" iiyama ProLite E1980SD 1280x1024 75Hz DVI DVDRW NEC DV-4551A (16x DVDRW) IDE 100MB zip floppy with 7+1 USB2 reader Mitsumi FA404 Using PS2 mouse (Logitech MX510 red) OkiPage 14ex laser printer NetGear WGR614 fireWall / 54MBi WiFi - OFF The Cause -------------- While the mobo is perfectly stable in normal usage, gaming is a problem. I working hard to make the mobo stable, it is not stable in 3D games. In the end of making it stable it is not stable even in 2D Windows... lol. To cut long story short - at first, it was just a mobo full of known bad caps that sometimes refuse to boot and losing clock AND bios settings when power is cut off. Sometimes it also crash during SoF2 _LOADING_ (never gaming), but that it is. Very rare crash. So I replaced all the caps, put even these that aren't there back in action and used hi-grade caps. For example the best polymers that even exist Nichicon LE for Vcore and for voltage supply there are Nichicon HZ caps - the best elyte caps even made - king in terms of ripple current, only Samxon GA is "par to par" with them, but that it is. Sourced from Digikey, so, originals. Result - still not stable. So I blamed the Radeon 9100 with questionable caps and added 120mm fan blowing on it. Still no help, rare crashes of game. Fast Writes disabled, AGP 4x (R9100 cannot go faster), 1 WS Write/Read used, Calibration ON. So I replaced the Radeon 9100 with GeFroce 6800GT, that have only 3 caps (Chemi-con polymers) and worked well for me before. Truth is a years ago... http://www.techpowerup.com/forums/showthread.php?t=189594 Problems get worser. Even exiting SoF2 or Quake3 is impossible now. It always freeze on exit...! It get reasonably stable for playing, yet try save screenshot and it crash ASAP. So I try lower the AGP rate (allow me to choose only 8x or 4x), disable Fast Writes, disable AGP Master 1 WS Write/Read and even disable AGP 3.0 Calibration Cycle (one by one). No help. So I toyed with the voltage, raising from 1.55 to 1.70 and no help either. Another thing that I added a huge nice heatsink on the NB, because the original one was pretty small and useless. And I discovered beneath it, that there was just a dip of white paste widely off center and that was it. Most of the heatsink did not even have contact with the chip...! So I tought - I got this! Laped a BIG heatsink, Arctic past used and screwed it tight on the NB... and again no help. So the last thing to toy with is the AGP Driving Value. It can be changed from 00 to FF, defaut on Auto show DA. Dunno what will happen, but I run out of ideas right now. Therefore I'm open to ideas. About the caps - there is one about 10uF SMD cap at the very end of AGP port. This cap I did not replaced. Could this be the culprit? Any suggestion about the Driving Value? I think - try 0 (00), 32 (20), 64 (40), 96(60), 128 (80), 160 (A0), 192 (C0), 224 (E0) and 255 (FF) and see, witch of these values give the best stability?