Reached a good stopping point on rejuvenating my QX9650/Win7 system.
I've given up trying to revive the P5Q PRO, and also fed up with the frequent stuttering of the G41M board in it, so managed to secure an inexpensive good condition Gigabyte EP45-DS4. Another DDR2 board (as I wanted to use my DDR2 RAM), on par or slightly more feature-rich than the P5Q PRO.
What I like: (compared to the ASUS board):
Onboard power/reset/clear CMOS buttons for easy initial debugging on a stand
More heatsinks and heatpipes for the MOSFETs and all the chips
What I don't like:
Don't like the Gigabyte BIOS of that generation. It's this Award BIOS that looks like it's from the mid-nineties. Tons of confusing menu options, very few of which are useful. They don't even have the ability to disable boot-up numlock. POST takes longer than expected. It seems the board resets itself 3-4 times before finally completing POST and proceeding. When the SATA controller is configured to AHCI, the drives don't show up in the main BIOS, only in the secondary post-POST BIOS, which delays boot further.
It wasn't smooth sailing setting it up. I was getting no POST / crazy beep symptoms / reboot loops. Went away after carefully cleaning the RAM slots and connectors on the sticks. Also, there seems to be something wrong with the main PCI-E x16 slot. It POSTs 100% of the time, but Windows almost always gets with black screen after boot, when powering off from shutdown or from soft reset (graceful restart). Strangely it almost always boots correctly from hard (ungraceful) restart. I tried several revisions of nVidia drivers, and even tried replacing the GTX 660 with a PCI-E x1 GT 710. Same symptoms. However, when moving the card to the secondary PCI-E (x16 @x8) slot, it always boots and restarts with no issues. Fortunately, the cooler on the Zotac card has just barely enough clearance to not hit the PCI slot below (PCI slots are slightly taller than PCI-E).
Still a couple of unresolved things - the GTX 660 always shows x4 in GPU-Z even when running the stress test. Incompatibility or slightly faulty card? No idea. I didn't find any BIOS setting that can explain that. Will try again later. Also the VIA USB 3.0 PCI-E x1 card doesn't work in any slot - it is detected and the driver is installed, but the 3.0 Hub always gets a "device cannot start" error. Here I am also willing to assume the card is faulty or incompatible with the board, as I've gone through several such cards from various manufacturers. They just don't seem very reliable. Will live without USB 3.0 in this system for a while.
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