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Memory speed, the CPU and the MB

post #1 of 8
Thread Starter 
Here's my situation:

I just bought my old Dell T3500 workstation from my job (it's for my kids and it was practically free).

It has a Xeon x5570 CPU and fairly lame Dell MB. I had a set of three Corsair Dominator 1600 MHz ram sticks lying around so I installed them on the system.

The thing is that the RAM clock speed, according to both BIOS and CPU-Z, is 1066 MHz.

Why isn't the RAM speed at 1333 MHZ - which is what the x5570 is spec'd to - or higher? I'm figuring that it has to be something to do with the MB.

Since it's a Dell, I have no way of manually adjusting the parameters in BIOS. But I'm wondering if anyone can shed some light onto me.

Or does anyone know a way to manually adjust BIOS parameters on a Dell MB?

TIA!
/M
post #2 of 8
It's very likely that the motherboard won't support memory speeds faster than 1066. frown.gif
post #3 of 8
Thread Starter 
Yeah, that's what I thought (even though it's pretty weird of Dell to offer a workstation with a x5570 and limit the mem speed to 1066 due to a crappy MB).

Is there anyway to (aside from the manual, which doesn't say much) to confirm this? Software or such?
post #4 of 8
Actually, according to Dell's Technical Guide, it should support Non-ECC DDR3-1333 in 3 x 1GB, 3 x 2GB, and 3 x 4GB configurations. Intel says that the X5570 should support DDR3-1333 as well.
Edited by svenge - 3/15/13 at 3:09pm
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post #5 of 8
Thread Starter 
Exactly! That's why I'm so perplexed.

I've written Dell of course but they haven't responded.

Is it possible that the 1600 MHz sticks are too fast (or overrated) so that the CPU/ MB just uses the default value of 1066?
post #6 of 8
Quote:
Originally Posted by Malachi69 View Post

Exactly! That's why I'm so perplexed.

I've written Dell of course but they haven't responded.

Is it possible that the 1600 MHz sticks are too fast (or overrated) so that the CPU/ MB just uses the default value of 1066?

Hard to say without knowing the precise model number of that RAM you're using. One possibility is that your RAM has default JEDEC SPD tables going up only to DDR3-1066, with an additional XMP setting for DDR3-1600. A motherboard like yours would only recognize the SPD tables and not XMP, and if DDR3-1066 was the highest SPD available then the motherboard would select it automatically.

If you can run CPU-Z on that computer and look at the 5th tab ("SPD"), it should list all the available SPD settings in its timings table. They'll be displayed as half of the RAM's nominal speed, so DDR3-1066 would be displayed as 533MHz, and DDR3-1333 would be displayed as 666MHz. You can look at a visual representation of what the timings table for a different model of RAM looks like HERE. The screen on the right side is the one I'm talking about.
Edited by svenge - 3/15/13 at 3:23pm
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post #7 of 8
Thread Starter 
The RAM is Corsair Dominator (CMP8GX3M2A1600C9) in a triple channel configuration.

There are three JEDEC frequencies (533, 609 and 685) plus XMP, which is 800 (iow 1600 MHz with DDR).

Normally, I'd just replace the motherboard but Dell uses the B-form (i.e. backwards) MB and chassis so I'm stuck with this set up for now.

Still, I'd love to figure out how to increase the clock speed - at least up to the x5570 spec of 1333 MHz.
post #8 of 8
Well, I'm fresh out of ideas, sadly.
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