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Ok to mix DDR333 with DDR400?

Forum Motherboards & Memory : Memory - Ok to mix DDR333 with DDR400?

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diznanl   09-03-2009 at 07:43:19 PM

I've got a 512 stick of DDR333 and a 512 stick of DDR400. I'm going to be running Windows 7 (just for kicks).

I should just go with both sticks and a lower overall memory speed than just one stick of 512mb DDR400, right?

Or, should I go with just the DDR400 and hope I don't run out of ram?

I'm thinking both. Right? :heink:

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AMDThunder   09-03-2009 at 08:05:09 PM
- 0 +

You can run both, but they will both run at 333.

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evongugg   09-03-2009 at 08:14:18 PM
- 0 +

Please specify your processor and FSB.

------------------------------ Google is your friend and Bob's your uncle
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Zenthar   09-03-2009 at 08:17:19 PM
- 0 +

Running Windows 7 (or Vista) with only 1GB of RAM might be a bit short.

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diznanl   09-03-2009 at 08:25:38 PM
- 0 +

Intel® Celeron® D Processor 352
(512KB L2 cache, 3.20GHz, 533MHz FSB)

Zenthar, I'm hearing you with the 1gb of ram...

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amnotanoobie   09-03-2009 at 09:03:20 PM
- 0 +

It should work, they're planning to use it for netbooks so maybe you could turn off Aero and hope for the best.

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diznanl   09-03-2009 at 09:13:39 PM
- 0 +

HA! So I booted the eMachine and went into the BIOS. Turns out, it's running both sticks at 400mhz. Ever heard of that? Weird... hopefully, I'm stable

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evongugg   09-04-2009 at 01:52:17 PM
- 1 +

Run memtest86+ and check for errors to stay on the safe side.

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------------------------------ Google is your friend and Bob's your uncle
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diznanl   09-04-2009 at 07:24:06 PM
- 0 +

evongugg wrote :

Run memtest86+ and check for errors to stay on the safe side.



excellent idea... I'm on it

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sminlal   09-04-2009 at 08:03:43 PM
- 0 +

I tested Windows 7 on a system with only 768MB of memory and it ran fine. I didn't try running very much at once on it, but it will certainly run on 1GB.

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diznanl   09-04-2009 at 08:07:43 PM
- 0 +

Yeah, it is actually running fine... Windows 7 boots quickly and runs smoothly. I'm actually at 768mb, also, because of the 256 shared memory.

That's the only thing this computer is missing: decent video. I'm going to run clockgen on the FSB and see if I can push it a little bit after I figure out if the memory is a-ok

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AMDThunder   09-04-2009 at 08:08:53 PM
- 0 +

sminlal wrote :

I tested Windows 7 on a system with only 768MB of memory and it ran fine. I didn't try running very much at once on it, but it will certainly run on 1GB.



Agreed. That was supposed to be one of the improvements of Win7. Vista is a hog. Can't wait till they ship my copy of 7.

------------------------------ Phenom II X4 940 @ 3.4
GIGABYTE GA-MA790X-UD4P
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diznanl   09-04-2009 at 08:35:58 PM
- 0 +

How many memtest86+ passes do you reckon I should run? It just finished without any errors. Maybe one more, for good measure?


Message edited by diznanl on 09-04-2009 at 08:36:17 PM
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sminlal   09-04-2009 at 08:51:45 PM
- 0 +

You shouldn't expect any issues simply due to the difference in memory speeds. As long as you're not overclocking the memory, I would treat one successful pass as a sign that all is well.

Reply to sminlal
yobigd20   09-04-2009 at 08:59:45 PM
- 1 +

Your bottleneck is going to be the amount of RAM (megabytes), not the speed. So yes, while both sticks will run at the lower speed (333), your system should be more responsive in multitasking due to the higher amount of ram in the system. Honestly though, you shouldn't really be running a windows 7 o.s. with less than 2gb IMO.

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diznanl   09-04-2009 at 09:06:50 PM
- 0 +

yobigd20 wrote :

Your bottleneck is going to be the amount of RAM (megabytes), not the speed. So yes, while both sticks will run at the lower speed (333), your system should be more responsive in multitasking due to the higher amount of ram in the system. Honestly though, you shouldn't really be running a windows 7 o.s. with less than 2gb IMO.



As posted above, the ram is running at 400mhz ... don't know why. But it is!

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