I want to upgrade my son’s computer. His video card is an ATI Radon X850 XT AGR AGP 8X/4X. Currently he has 2 Corsair Ram Cards, CMX512-4400C25 1 GIG total. I have been informed from Corsair that this card is no longer available. His Mother Board is a K8 Triton Gigabyte GA-K8NSC-939 nForce3 250 Gb . It has two more empty slots for RAM Cards. The processor is an AMD Athlon(tm) 64 processor 4000+ 2.5 Ghz 1.00 GB of RAM. I built this machine about 4 years ago. I want to upgrade it to 2 gigs of RAM. Can anyone advice me where I can purchase another compatible RAM Card that would be the best solution to upgrade to 2 GIGS of RAM or do I have to take just completely change the RAM?. I heard different RAM types do not work well together. He uses his machine primary as a gaming unit. Any other suggestions would be appreciated to upgrading his computer but there is a cost factor as always. Need the most performance for the least amount of money. Sort of between jobs currently. Thanks for any help you can give me. Please try not to laugh.
New info: (maybe)
Here is more info on the Ram:
XMS XTRE ME MEMORY SPEED DIMMS
CMX512-4400C25 XMS4400 512MB 2.5-4-4-8 184 DIMM Black

• Mfr Part Number: CMX512-4400C25
• Type: DDR
• Capacity: 512MB
• Speed: PC4400 550MHz
• Pins: 184-pin
• ECC: No
Thank you
Aubrey Rogers

What speed ram is it? ddr2 667? 800? And what's the max supported ram model?

Ram is dirt cheap those days. 4gb of ddr2 800 cost as little as $65.
http://www.newegg.com/Product/Prod [...] +(2+x+2GB)
It might actually be cheaper to get new ram and change those old ones out, instead of trying to find matching old ram. Hardware that are hard to find tend to be more expensive even if you do find them.

List your price range first.

Sir,

You currently have DDR-1 "550" RAM rated at a speed of PC4400.
This memory was approximately $400 in 2004 for 1GB. That was definitely a high-end enthusiast memory at the time.

DRAM prices have fallen drastically in recent times where you can purchase 4GB of DDR-2 RAM with a speed rating of PC-6400 for about $100 USD.

Unfortunately, your nForce 3 System Board does not support DDR-2 RAM.
The closest match to the RAM speed you currently have is this item on NewEgg - 2GB DDR1 PC-4000. However, I cannot recommend its purchase.
(it is too expensive for the performance improvement you will see).
http://www.newegg.com/Product/Prod [...] 6820146034

If you insist on getting 2GB of RAM for the least money spent, I would suggest removing the existing RAM and replacing it with two 1GB DDR PC3200 sticks from NewEgg. However, this would only likely improve responsiveness of the windows operating system under multi-tasking use.
It will not improve gaming speeds at all. For this, you will most likely need to upgrade the Video Card.

If more gaming performance is what you desire, i'm going to have recommend that you switch out the PC's core components (System Board, CPU, Memory). Here is a recommendation (since i don't know your budget).

1. Fry's will hold sales of its Q6600 or E6850 for about $200 with a free Motherboard.
2. 4GB of DDR-2 RAM can be purchased for less than $100 dollars.
3. ATI 3850 512MB or nVIDIA 9600 GT for about $130.
4. A PSU upgrade may be necessary.
5. 3rd party CPU cooler may be needed if you choose to overclock.

*The free system board may not be high-end, but it gets the job done for most uses. You can switch this out later for a P35 board for about $130 as an example...

guys he's running an nforce 3 board.. that is soclet 939 and DDR 1 not DDR2...

I would go with this for ram...

http://www.newegg.com/Product/Prod [...] 6820231039

2GB DDR PC3200 gskill has not let me down yet and it's only 60 plus shipping on the egg...

denset beat me to it..lol