RAM chip combination

The best thing to do is to put the biggest (the one of 128 MB) into the first slot and the smaller one in the second one.

you must ensure that the two memory modules are the same speed as each other, otherwise the PC will not work. Also make sure the motherbourd is fast enougth to support the speed of the RAM, i.e. a motherbourd with a speed of 100mhz will not support RAM that has a speed of 133mhz (this is known as the FSB). To see what FSB your PC is you need to go into your Bios and look at something like 'system information'. You should be able to use just about any brand of RAM in your PC. Also you cannot use a comdination of DDR and SDR memory. Hope this helps.

"a motherbourd with a speed of 100mhz will not support RAM that has a speed of 133mhz (this is known as the FSB). "

This is completely incorrect.  Memory has RATED speeds, not hard wired speeds.  RAM does not have an inherent speed, it has a speed rating for the fastest it can be accessed reliably.  If the memory controller is slower than the memory's top rating then there is no problem.   There is only a problem in the reverse, when the controller tries to force slow memory into running at a faster speed than it is rated.  Also, memory controller speed is NOT known as the FSB.  The Front Side Bus is the speed with which the CPU comminucates with the chipset, including the memory controller.  Almost always this speed is the same as the memory controller's speed to access the attached memory in modern motherboards but this is a convience of timing from an engineering standpoint.  They are not the same term and in some systems, especially in the past and really especially in non-x86 PC chip systems, not always the same.

Tut tut silly me, I got it the wrong way round. Plus I did not surgest anything about the memory controller. I was just telling him basically you cannot mix and match different types of RAM and speeds. This is what he is asking about, so apart from the false statement my 'comments' are actually correct.

I would tend to disagree with the statement "you must ensure that the two memory modules are the same speed as each other, otherwise the PC will not work." Altho it is a good idea to run memory of the same spec (especially with the prices out there), if your mainboard runs lets say PC2100 spec parts, and has a perfectly good module in use, adding a PC2700 module would do no harm and the system will function just as well... just at the PC2100 spec. The reverse could cause problems.. lets say you have a system that runs PC2700 parts.. and you find a bargain on PC2100 or less parts... then you would have problems

but all that said... I do not mix memory in systems.... it is just not worth the headaches of having customer issues... and finding out it was because I went short to save him some money

"I would tend to disagree with the statement"

I don't just tend to disagree with it, I know it's just incorrect.  I defy anyone to find a clock crystal on any SDRAM module.  Memory does not have a speed of its own, just a rating for how fast it can be reliably run by the controller.

This is like another thread where some poor fellow is confused about his 80 wire IDE cable and various "experts" are referring to the cable as having an inherent speed of its own.

Yes u can do it , but both ther memory module should be same and your BIOS should be accpet the heigher memory. i am also using same thing 64 mb SDRAM and 128 MB SDRAM  total capacity is  192 MB ram.

I tend to disagree with those that tend to disagree with "a motherboard with a speed of 100mhz will not support RAM that has a speed of 133mhz"

Although the PC133 spec www.dewassoc.com/performance/memory/Intel_pc133_valid.pdf gives backwards compatability with PC100 you will note on table 8 that to ensure compliance the memory has to be tested at both speeds. I've seen PC133 RAM that works in 133MB FSB machines but not in 100MB FSB machines, obviously this RAM is out of spec: if Toh is a bit less than 3 ns then the 133MB FSB machine will read good data but these data will be invalid by the time the slower 100MB FSB machine reads it.

so, does that mean I agree to attend to those who tend to aaaaaaargh, i don't think i feel good :<)