Two memory modules

Hi, i have a K7T266 pro2, i use to have 256mb of pc2100. Now i bought another ram module a 256mb pc 2700. both from kingston. But my bios only shows 256 mb of ram, it does not read both modules at the same time. It accepts pc2700, so thats not the problem, but what is?.
Can this motherboard not accept when running pc2100 and pc2700 at the same time.(it can function, but it reads only 256)
thanx!

yes, i have tried all combinations, and it has no problem with the 2700 stick, when i run them at the same time the bios says that the other two slots are empty. sometimes it says the slot with the pc2700 is empty, and if i change combination it would say that the slot with pc2100 is empty.
so i dont now..

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**Click the KUDOS thumb up on the left to say 'Thanks'**
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Bonjour à tous.
That’s the first time I post… It’s hard for me to write in english…
My motherboard is K7T Turbo (MS-6330). I have two problems :
1. I have three memory modules : 256 MB, 128 MB and 64 MB. All three are 133 MHz speed.
The memory test of Norton Utilities indicates alwys an error at an address about 356888576 (the address is not always the same, but always greater or equal than the one I wrote above.
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I'm currently using two 512MB memory modules in dual channel. i want to add more ram to my machine, but i want to keep the pieces that i currently use. so my question is, can i add one more module (1 GB) so that i will have a total of three modules (2GB), or adding the third module will cause instabilities and i should stick with even number of modules (2 or 4)?

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