Thanks for the info. Like to keep appraised as much as possible. The Mtech mobo that I previously used when 168 pin SDRAM and EDO DIMMs first came out ( currently out of productions) had a similar statement. It took reading it numerous (at least 10 times over a period of time as I investigated what is a DIMM. Finally figured out what they were saying in the sequayed (sp?), Japanese translated. (It was in 3 different sections). That mobo could use mixed SIMMs and DIMMs but only if both were EDO. If using SDRAM DIMMs, they could not be mixed with SIMMs of any type (EDO, FP). I am on another mailing list of all high end user/builders and this subject has come up numerous times especially several years ago when we all were trying to sort out this new DIMM thing. These people all use high end mobo and they all say do not mix SIMMs (EDO and/or FP) AND SDRAM DIMMs because of the voltage difference. Some have mentioned a mobo that actually sets the two slot voltages separately and is therefor okay to mix but I do not remember which one that is. It is also concurrence on the list that unless you have a mobo that does that, do not mix SIMMs and SDRAM DIMMs. (As previously mentioned SIMMs and EDO DIMMs are okay to mix.) Some have done it and their 3.3 v SDRAM DIMMs don't usually burn up immediately but since the voltage is considerably out of tolerance, in time, errors, lockup, and maybe destruction of the DIMM occurs. Even the newer Super 7 mobos do not allow for this mixing. That is why when a novice who does not understand and especially does not have documentation asked the questions, the answer is always do not mix. Even with documentation, it can be very confusing even for us in the business what the manual is saying. And since there is no real speed advantage (theoretical yes but in actually testing that we did on the other list on many mobos, the SDRAM was actually slower than EDO SIMMs), I always suggest adding more EDO if you already have it espe cially on older mobo. And as I said in my previous post, many older mobos had conflicts with certain brand and/or no brand DIMMs and certain chips from some manufactures Therefor with all considerations going with SDRAM DIMMs on an older mobo after using EDO especially with out documentation, the chance of success immediately and in the future especially for a novice is slim. Hence, my recommendation, do not mix. Could it work...stranger things have happened. But most novices are not prepared knowledge-wise and emotionally (frustration after days of trouble shooting) for the 98% possibility on conflict and troubleshooting software lockups, BSODs, etc. due to poor, in proper application and/or conflicting hardware. On the other hand, I am glad you are in the 2 % :-)) Daniel Wysocki Twin*.*Star Computers 770-498-2582 / 800-816-0663 Fast, Reliable, Wallet-Friendly [log in to unmask] ---------- From: Jim Meagher[SMTP:[log in to unmask]] My EPoX manual states "... supports standard Fast Page, EDO (Extended Data Out or Hyper Page Mode), or synchronous DRAM...." It also states that DIMM socket 3 can not be used in conjuction with the two SIMM sockets. There is a discussion about RAM speed, but there is no mention of voltages and there is no jumper for RAM voltage, so I assume it just does what is necessary. The other two motherboard manuals have similar statements. PCBUILD maintains many useful files for download on our web site - visit our download page at: http://nospin.com/pc/files.html