I have a old HP 751N. It currently has 512mb ram, but i need a boost. It originally had 256, but they upgraded it for free from the place i bought it.

Question is, since its a HP, i'm not sure if i can use any RAM that they make. I know it uses PC2100 though. But is there any "HP certified RAM"?

If not, would this work? http://www.newegg.com/Product/Prod [...] 6820141217

Thanks for the help

Also,

I have a Radeon 9800 Pro 256mb. I want to upgrade to something a little better, I don't play many games, just battlefield1942 and counterstrike. Less than $100 if possible.

Thanks

You might try entering you HP 751N in these memory configurator to find tested and guaranteed to work memory upgrades for your system. You could also send an email to the company support asking for suggestions or defnite answers regarding compatible memory for your system. Basically, if you are 'adding' memory to your system as long as the voltage required and the CAS latency are the same, there is a good chance the new RAM will be compatible.

http://www.corsairmemory.com/configurator/default.aspx


http://www.kingston.com/


http://crucial.com/

Well I wont really 'add' I'm replacing the 2 sticks in there with 1 gig sticks. Still trying what latency is ok or whatever.

Make sure your motherboard can handle 2 gigs

3 things you must be concerned with.....
1. Same type of memory (Rambus, Sdram, DDR, DDR2, Etc)
2. Same voltage as the memory you have now, most likely the HP BIOS is not going to provide any voltage variables.
3. Will the HP recognise memory chips that large? If it only came with 256 meg, it may only be able to use memory chips up to 512meg each.

The HP website will tell you what will work for your system, just go do your homework.

http://h10025.www1.hp.com/ewfrf/wc [...] 70&lang=en

The system can handle 2GB of RAM. It's designed for PC2100 DDR1, but you can use PC2700.

Will there be a big difference between 2100 and 2700? I guess i have 768mb RAM though. Also, according CPU-Z, they are running at 2.5v, and here is other info:

Memory Type DDR
Memory Size 768 MBytes
CAS# Latency (tCL) 2.5 clocks
RAS# to CAS# (tRCD) 3 clocks
RAS# Precharge (tRP) 3 clocks
Cycle Time (tRAS) 6 clocks
Bank Cycle Time (tRC) 10 clocks

Module 1 DDR, PC2300 (142 MHz), 256 MBytes, Infineon
Module 2 DDR, PC2100 (133 MHz), 512 MBytes, AMD

Can I just take both those out and swap them with 1 gig each? There are only two slots.

RAM being backwards compatible, PC2700 333Mhz. will simply default to PC2100 speed of 266Mhz. So runswindows95 is giving you a good suggestion. PC2100 is getting kind of rare or harder to find. Crucial doesn't offfer PC2100 anymore. They suggest PC2700. PC2700 is still 'widely' available at places like newegg. So, if you are not sure about the PQI dimms you have chosen just send an email to PQI support and ask if compatibility is an issue. PC2700 on Newegg would also work fine as mentioned. For that matter so would PC3200:

http://www.newegg.com/Product/Prod [...] 6820231047

I have a used a ton of the Kingston value RAM, mostly PC3200, and I have used the exact Crucial PC2700 here (A 512 DIMM) added to a factory installed PC2100 DIMM. Still working today for the guy (not in dual channel though).

http://www.newegg.com/Product/Prod [...] rder=PRICE

So 2700 and 3200 would be ok to use, and the prices are pretty similar. But since my mobo doesnt support dual channel, will it matter? I also notice that G.Skill 3200 runs at 2.6V. Mine currently are at 2.5, does it matter?

Would it be better to get the 1gig sticks separately or by a 2gig pack with 2 of the same 1gig sticks?

Well, PC2700 and PC3200 will require slightly more voltage than PC2100, but yes the RAM speeds are compatible because RAM is backwards compatible. Really I am not familiar with your HP system. I mean I have never worked on one. If it were my machine I would be fine sticking PC3200 in there if it works without issue (no guarantee). The PC2700 Crucial or Kingston will most likely work fine, speaking from my experience with the RAM. I have one unopened 2 x 512 Kingston value RAM PC3200 stored away for someone just like you . Yeah, your system will likely not run dual channel (don't know that for sure though), but buy a 2 x 1GB kit. Cheaper and having a nice 2 x 1GB kit of DDR around is a good thing to have, especially PC3200 400Mhz.

Like I said, if you go on Crucial's website, they no longer distribute PC2100. They recommend PC2700 when someone requires PC2100.

See, Crucial recommends PC2700 and PC3200 for your HP system. The company does not distribute PC2100 any longer. These are guaranteed to work.

http://crucial.com/search/searchre [...] %20751N%20

I checked that crucial site an found:

http://crucial.com/store/mpartspec [...] 8DA5CA7304

Should I just get 2 sticks of those? Or should I get this:

http://www.newegg.com/Product/Prod [...] 6820148089

I'm not sure if its different sticks, just that one has 2 1 gig sticks.

The kingston is cheaper:

http://www.newegg.com/Product/Prod [...] 6820134177

but what is the difference? they have the same specs, does one brand usually perform better than the other?

Crucial uses a different product number than the RAM they package for retailers like Newegg. Likely the exact same RAM. I would think the Kingston will work just fine. I have used manbe nine or ten GBs of the Kingston PC3200 value RAM (big brother) in any number of machines and it has worked in every single machine and in some machines other RAM would not. So, I would give the Kingston PC2700 a shot. I have also bought RAM directly from Crucial many times. Their word is good and their RMA is fast if you have a problem.