I'm glad I found this board -- seems to be pretty active and I've found lots of interesting discussion about memory problems others have had. As you can probably guess, though, my problem is specific to my system and therefore I needed to start a new topic.

I have been using the following self-built system for a couple of years:

SOYO SY-P4VTP Mobo
Intel P4 3GHz
1GB DDR-400 Dual-Channel RAM (2 512 sticks)
Windows XP SP2

Today I decided to buy more memory for my system, and picked up a Buffalo brand 1GB DDR-400. I brought it home, and tried to add it to the other two sticks. No dice. BSOD, memory errors, etc.

I rebooted my system with the original two 512 sticks, and everything worked fine. I then booted with only the new 1GB stick, and had all kinds of memory problems as before.

I brought the new stick back to the store, and had it exchanged for a new one. I decided to pick up another 1GB stick with the idea that my new and old sticks may conflict, and 2GB was my goal in the first place.

I took out the old sticks, put in the new ones, booted up, and had the same BSOD/bad boot issues I had before. I put in the old sticks, and the problems went away.

Here are some facts:

1) The motherboard supports up to 1GB memory in each of the three slots.
2) I bought the sticks at Microcenter, and they're usually pretty reliable (at the very least not shady).
3) I have now been using the machine with the original 512 sticks for an hour with no sign of trouble.

Is it possible to have purchased two (or three!) bad sticks in one day from the same place?

Does the fact that the old RAM is dual channel and the new RAM isn't cause problems I don't know about?

Is there a way to check to make sure my settings are configured to the new RAM?

How can I test the RAM if I get the BSOD every time I boot with the new RAM?

I eagerly await any and all guidance.

Your MB supports DDR 2.5V DIMMs. If the Buffalo DIMMS you bought requires say 2.8V to run, you would have to set your memory voltage to those specs, 2.8V (if the MB supports it). You might check in BIOS what your memory voltage is set at to run the two 512's that work fine. The required voltage to run the Buffalo RAM should be written on the package, the DIMM or can be found on the product website under product specifications.

http://www.soyousa.com/products/pr [...] 9fca33aac2

Wow, awesome lead, badge.

According to Buffalo, the voltage is listed as 2.6V + .2V. How does that .2V factor in?

Will my old RAM work if I change the Mobo setting to 2.6V now? Or should I swap the new ones in first?

Update on the above -- I went into the BIOS and according to my PC Health the DRAM is running at a voltage of 2.62V, which seems to line up with the new sticks, right?

Try and set your MB RAM voltage up a 'notch' (.1V) higher for the Buffalo RAM. yeah, 2.6v should supply the correct voltage to the new RAM. mfg. specs say 2.6v. +.2. I'd try to increase the vltage slightly and maybe try just one DIMM of the new RAM in slot one. of course you would have to make the increase with the old RAM, shut down then try to boot up with one DIMM in slot one.

If the timings on the new sticks are looser, say 3-3-3-10, and you're old sticks are 2.5-3-3-8, those "old" timings would cause crashes. I've seen quite a few boards misread the SPD settings on sticks lately as well, so check those timings.

Badge -- the mobo was already running at 2.6V before I did anything. Would that suggest the voltage isn't the problem?

utatka95 -- can you be a little more specific on how to check the timings?

2.6v should be good to run the RAM. I don't know, really the RAM should work. PC3200 is common, maybe you could test in another machine. Maybe return it again and get a different brand. Kingston and crucial have RAM configurators and guarantee their RAM will work with your board. Put in your MB here and see what you come up with:

http://crucial.com/

http://kingston.com/

I put the new sticks in another system here, and had successful and stable boot-ups with each stick individually, and together. Just for fun, I then booted with the existing RAM from that box and the new sticks, and now the system is running stable at 3GB.

So, I'm fairly convinced the sticks aren't the problem.

One thing I did detect when going through my BIOS is that the DRAM CAS Latency is currently set to 2.5 (with the old RAM installed), which was set due to the Auto By Speed setting being checked.

According to the specs at Buffalo, the RAM I have calls for a CAS Latency of 3, which seems to fall in line with what utaka95 suggested. I can manually change the CAS latency, but wouldn't the BIOS have automatically set itself to the proper latency in the Auto setting?

I'll play around with it and see what happens.

If the Buffalo are rated at CAS 3, it is possible that RAM will not boot with that 2.5 CAS LAT setting. definately set the CAS LAT to 3 and try.

As a rule 'Auto" for CAS timing will either default to the highest CAS supported by all of your memory sticks, or to 3(as 3 should always work). The 2.6 +.2v means the RAM is designed to work at 2.6v - 2.8v. I try to keep stock voltage unless I have a reason. Adding more voltage does make more heat, but is also more overclockable. Because you don't care about overclocking at the moment and want stability just to start, upping to 2.7 or 2.8 could be a way to go.

I don't have any SOYO motherboards, and I didn't read the manual or anything, but I have seen a few motherboards that don't like it when you use RAM that isn't 'top of the line' in the first slot. As long as your first slot doesn't have any 'junk' ram it'll work fine.

I would do a memory test with memtest86+ or something of the sort before you call it 'stable'. It could be that you just haven't attempted to use any memory locations that are 'bad'. I don't think it's likely at all that you bought 3 bad sticks of RAM on the same day. I have personally only seen 3 bad memory sticks in 15 years. It's very rare, and if you did get 3 bad sticks buy a lottery ticket RIGHT NOW!

If you desire to use the 2 new sticks only, try manually setting voltage as high as 2.8v, and CAS to 3(or maybe even higher just to see if it works). If you can't get the ram to work at 2.8v@CAS 3 then clearly something else compatibility-wise is wrong. I bet if you set it to 2.8v@CAS 3 it'll work for sure with 2 sticks, but you never know. If it doesn't take it back and buy a different brand.

I had trouble like this several times. What works alot of the time is resetting the cmos either via jumpers or taking the battery out for 3 mins or more. Now the system has to rerecognize the ram. Works 99.9% so far for me.

OP can't even get to post with the new RAM. OP has not booted the computer to BIOS at all with the new RAM. Run memtest?

To be clear, badge, I was able to get into the BIOS, but everything broke down from there -- including odd stuff like the USB keyboard not being recognized.

I'm going to manually change the CAS setting to 3 and see what happens.

And, for the record, I did jumper the CMOS, and the RAM wasn't being recognized.

I'm hoping the CAS setting does the trick, or else I have a feeling I'm going to have to switch to a different brand of RAM.

Any opinions on Corsair, if it comes to that? It's comparably priced.

I agree it looks like that RAM is just not working on your board. Give the 3 CAS LAT a try and return it for something you are sure will work. Your MB is a bit old, but maybe you can find some RAM tested and guaranteed tio work with it. Corsair has a configurator:

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

Look in your manual and see what Ram is compatible, and buy some from the list.