compaq c751nr memory upgrade

Today I purchased a compaq c751nr notebook for an extremely reasonable price, and got an even better price for Vista Ultimate (which I'll need for work). Since the notebook only came with 1GB of memory, I'll be upgrading. What is the maximum amount of memory for this model, 2GB or 4GB? I would like to have at least 2, but am willing to pay the difference to go all the way to 4 (rather 3.6 or so in 32 bit Vista).

Thanks for any help you might have.

 

Should be 4 GB with the newest BIOS.

 

BIOS provided by compaq directly? I'm not too comfortable installing hacked BIOS files. BTW, what is the most recent BIOS?

 

F.31 should be the latest version.

According to the specs on HP's web page, the max supported is 2GB. However, trying out 4GB wouldn't be a bad idea. Most systems sold these days support 4GB even if the specs dont officially mention it. Just buy the RAM from a place which has a good return policy and you should be fine.

 

I'm actually looking to upgrade the ram in my C751NR as well. Anyone know what the speed of the ram is? I've seen some websites that list it as ddr2 667 (pc2 5200) while Microcenter shows it as ddr2 533 (pc2 4200). My guess would be the ddr2 533 because the FSB on the motherboard is 533.

Also, I reformatted vista and installed windows xp after I purchased it. Would upgrading the bios affect my laptop because it doesn't have the original OS?

Thanks for your help guys.


Link to microcenter with tech specs: http://microcenter.com/single_product_results.phtml?product_id=0288973

 

Yeah,if the processor FSB is limited to 533MHz, then the memory is going to run at that speed. So, a DDR2 667MHz memory will downclock to 533MHz. Either memory should work fine, get whatever is cheaper.

If you are not experiencing any issues with the current BIOS, I wouldnt bother upgrading. As long as your system runs stable updating the BIOS with XP shouldnt be a problem.

 

Hi,

Just to let fellow Compaq C751NR laptop owners know, it works w/more than 2 gb installed.

With Bios F.24, I tried 3 gb, a 1 gb and a 2 gb stick I had, in my C751NR, and it worked. The 1 gb has to be installed first, then the 2 gb.

So I would imagine, 4 gb (2x 2gb sticks) should work too.

Just to have my laptop up to date, I upgraded the BIOS to F.31, w/no problems.

Also, according to the maintenance manual on the C700 series laptops, they support cpu's w/FSB's of 533, 667, and 800 MHz, and support cpu's up to the T8300. C700's are suppose to have the Intel GM965 Chipset.

http://h10032.www1.hp.com/ctg/Manual/c01301275.pdf

.

 

Intel's website says that the T2330 with a 965 GM chipset (which is what the C751NR has) is capable of handling up to 4 GB of RAM.

The specifications for memory capacity on HP's product page are incorrect.

They specify that the maximum memory is 2 GB. Online several owners of the same machine have reported using 1 gigabyte in the first slot and two in the second slot, with no problem, although 2 GB in the first slot and 1 gigabyte in the second did not work.

I tried a 2 GB DIMM in the bottom (first) slot, and with one of the original 512 MB DIMMs in the top slot, the machine would get to the point of asking which operating system to boot to, and then went back to the beginning of the boot sequence. In Windows XP safe mode, the system got as far as loading MUP.SYS , then stalled. Memory self test was okay.

With 512 MB in the bottom slot and the same 2 GB piece in the top slot it works fine (so far).
I have the F 21 bios. On HP's website for this machine, they list an F. 33 bios under the Vista operating system page, but not the XP page, FWIW.

The machine is quite snappy under XP, and though I haven't yet done a head-to-head comparison it seemed slower in Vista. The main benchmark I used was Nuance NaturallySpeaking. On a T2310 Toshiba running Vista Premium the response was definitely too slow. On this machine with the T2330, under Vista Home it was slow, but under XP it's acceptable. This was with 1 GB of RAM. After adding the 2 GB piece and going up to 2.5 GB, it seems to respond a little bit faster, perhaps 30%. The main difference is that there's less hesitation with recognition. Accuracy either way has been excellent.

I hope this has been helpful.

 

It doesn't matter if it's not listed under xp. The website just isn't consistent. Download the latest bios regardless and flash away

 

After reading this forum, I ordered 4 gb memory for my C751NR (2x2gb sticks - Corsair 200 pin PC2-5300 677 Mhz). I even updated my bios to the latest one F.34 from F.24 that I had previously. But my system is just not able to detect 4 gb memory.. When I install both sticks, and restart the computer, it goes to the point of running the Operating System, and the the system restarts.. I removed one of the sticks, and left the other 2 gb stick in the bottom slot, and the system booted fine and the windows is able to detect the 2 gb memory.. I then removed the 2gb memory from bottom slot, and left the bottom slot empty and installed the 2gb stick in the upper slot, and the system again booted fine with windows detecting 2 gb ram.. and I did this with both the memory sticks that I bought just to check if both my memory sticks are working fine, and they did..

So can anyone please tell me what can I do so that my system will detect 4 gb ram (or slightly less than that since I have Vista 32 bit OS)..

Thanks for your help.