Dumb Question

[The PIT]

I've just upgraded my memory to 1.5 gig.

So theres 2 x 512mb sticks and 2 x 256 mb of sticks. I don't know whether I'm in dual mode or not.

Before I had 2 512mb sticks in slots 1 and 3 and that was in dual mode when I could see the bios screen during boot up.

I've now got it as 512mb in 1 and 3 as before and 256 mb in 2 and 4.

The machine seems faster as these are cas 2 chips and not the cas 2.5 I ordered. So I still think I'm in dual mode although the bios what I can see of it doesn't say anything at all.

Any programs that would tell me. Sandra doesn't.

[Tjalfe]

as far as I know, since the 875 chipset requires two modules at a time, you will have to be running dual mode if it sees all the memory. a memory benchmark will surely tell you by the numbers if it is closer to 2.7GB/sec or 5.4GB/sec
( assuming machine in sig is the one being discussed )

[The PIT]

I'm not so sure looking at the book it suggest that they may have to been of the same memory size. But it's so vague.
Running Sisoft sandra gives a memory through put faster than the 850 chipset while previously it was a tad slower. Differance in cas speed that. Thats suggests it's in dual mode.

[Admiral]

At 333 MHz It should be around 3700 in dual channel compared to about 2500 in single channel in Sandra's memory bandwidth test.

[The PIT]

Well with Nortons Firewall in the background it registered around 3400 so I guess it's doing dual channel.

[ayoub_ibrahim]

time to update your sig TP!

[tonny]

i've got an intel d875pbz mb.
here's a link to how they say the memory needs to be configured for dual channel. it's likely to be the same for all 875/865 based boards.

http://support.intel.com/support/motherboards/desktop/memmodes.htm

[The PIT]

Theres a another way.

I just pulled of two of the dimms and placed then in one bank and ran Sandra and the scores dropped. So it's defintaly in dual mode.