After some debate (and QHN mentioning it would of interest to see), I've decided to go ahead and create a thread for these machines and the upgrade information that I have for them in the hopes that it will help some people who may have them and want to push them or give them some longer life.
Some brief background: I purchased my DV9700 in late 2008. It came stock with an Intel Core 2 Duo T5750 (2.0 GHz, 667 MHz bus, 2 MB L2 cache), 3 GB DDR2, 240 GB HD space (120GB x 2, one of the main reasons I chose this machine was its 2 HD capacity), and an nVidia GeForce 8600M GS with 512 MB of RAM.
I began to wonder as the machine aged what upgrades were possible. I did more than wonder when I accidentally screwed up a BIOS flash. Shopping for replacements, I learned not only that they existed but that there were SEVERAL different ones. THAT lead to me learning all I know about the Compaq Presario C500 series, but that's already covered in a Stickied post (Thanks, QHN!)
To keep this as short as I can, this is the information I have found first hand:
Motherboard 461068-001: Intel based, Socket P, 800 MHz bus maximum, dedicated graphics (GeForce 8400M GS, 256 MB), NB chipset PM965
Motherboard 461069-001: Intel based, Socket P, 800 MHz bus maximum, dedicated graphics (GeForce 8600M GS, 512 MB), NB chipset PM965
RAM support: The PM965 chipset is STATED to be limited to 4 GB of RAM, but I have found that 461068-001 will work with at least 6 GB, and 461069-001 runs just fine with 8 GB of RAM. As they have the same NB chip, it's more than likely that 461068 will also run with 8 GB. My only available 4 GB sticks are Corsair PC2-6400 sticks, but they've worked in both boards. Some boards with integrated graphics may have a GM965 (as opposed to PM) or some other brand chip (nVidia, AMD), so the RAM support may not be the same. However, the only difference I know of between the PM and GM965 is that the GM has an integrated graphics card. THEORETICALLY the RAM support should also go as high as 8 GB. Your mileage may vary.
CPU support: Basically ANY 800 MHz bus Socket P CPU SHOULD work. The most powerful CPU that I know of is the Core 2 Duo T9500 (2.6 GHz, 800 MHz bus, Penryn-6M). Obviously, 667 MHz bus chips will also work, again provided they're Socket P.
ALL the information I have says that 800 MHz bus is the maximum the boards will run, so I've never spent the money to test a 1066 MHz chip. My system has also been disassembled so many times I'm getting nervous about doing it any more.
There are SEVERAL more boards available, many AMD based. You would need to research these as the information I have is sketchy at best. The only upshot to those boards I can find is they're all the same socket (S1), so CPU hunting may not be hard for them. I have no support information though either way. There's one other Intel board I can find right now:
445178-001: This appears to be Intel based and a "generation" older than the two listed above, with a GeForce chip with 512 MB of video RAM. The north bridge chipset info I've found says i945PM, which would mean the system would be limited to 4 GB tops from what I know.
Of all the boards I HAVE found and seen, 461069-001 appears to be the TOP board with the best specs.
One thing to be aware of in any search that you do for boards: The DV6000 series boards are VERY similar to the DV9000 series. However, they have their battery connector mounted further BACK on the board so it's likely that neither type of board would work in the other style case. If they WERE cross-mountable, the gain would be limited to any "new" hardware they might run while AC powered as it's not likely your battery would still be usable.
As far as upgrade efforts: HP provides a maintenance guide for the DV9000 series on their website. It's VERY useful and informative for disassembly instructions. However, be advised that the part information listed in it is not 100% accurate for EVERY DV9000 series model. I can also provide some fairly extensive help if anyone has any questions as I've pulled mine apart at least a dozen times or so now.
The only advice I can offer from experience is to be EXTREMELY careful with the two ribbon cables that require force to reconnect (the Quick Launch and Power ones). You CAN lose the QL ribbon without losing the computer, but the Power ribbon is necessary and the system will NOT function without it. Also, the NB chip has a "pad" of what I THINK is parafin based cooling material on it. PRESERVE THIS as best you can when removing the cooling assembly as I have not found any suitable replacement without buying a fully new cooling assembly.
I do have pictures and if there's interest or need I will post some or all of them if they're requested. I grant you this isn't as in depth as the C500 information there is now, but there are FAR more options to choose from with the DV9000 series. At least this should give people an idea of what the top levels are they can get these machines to.
O Shadow Fox O
Edited by OShadowFoxO - 10/9/11 at 2:35pm