Help solve my memtest86 failures

[airedale]

Specs:

E6300
P5B Deluxe
Corsair XMS 6400C4 DDR2-800 4-4-4-12

I overclocked my machine with these settings:

429 FSB
1.3625 VCore
1.55 Northbridge

I ran memtest86 last night and it failed like crazy.

Could it be because of me not setting my voltage? The memory was set to a 1:1 ratio, so it wasn't even overclocked too high. Was almost at the rate it is rated for.

I reset everything to Auto and now it is running at it's "normal" speeds. I ran it through test 5 for an hour without any failures and I have had it running for about an hour through the normal tests without any failures.

From the latest tests, I am hopeful it isn't bad memory - so any ideas on what I did wrong?

Thanks!

 

[stevty2889]

Trying running your mem at below rated speed, rather than above it..it is overclocked if you are using a 1:1 ratio, it's running at 858mhz..and did you boost the memory voltage at all?

 

[imported_inspire]

I thought to get Memory BW on DDR2, you multiplied FSB by 4? Or is that just for the A64's? I'm getting 1316 MHz on the memory if I'm right....

Either way, you'll need to boost the memory voltage?

 

[myocardia]

Originally posted by: inspire
I thought to get Memory BW on DDR2, you multiplied FSB by 4? Or is that just for the A64's? I'm getting 1316 MHz on the memory if I'm right....

Either way, you'll need to boost the memory voltage?

You don't multiply by 4 for any RAM. DDR is DDR, it doesn't matter if it's DDR, DDR2, DDR3, or DDR12. The double is the only part that matters. You're getting 658 on your RAM.

 

[imported_inspire]

Originally posted by: myocardia

Originally posted by: inspire
I thought to get Memory BW on DDR2, you multiplied FSB by 4? Or is that just for the A64's? I'm getting 1316 MHz on the memory if I'm right....

Either way, you'll need to boost the memory voltage?

You don't multiply by 4 for any RAM. DDR is DDR, it doesn't matter if it's DDR, DDR2, DDR3, or DDR12. The double is the only part that matters. You're getting 658 on your RAM.

Then how come my DDR2 runs at 800 MHz off a 200 MHz FSB? And how do explain that he raised the FSB and didn't mess with dividers and now his memory runs below the stock 800 MHz?

 

[Pabster]

Originally posted by: inspire
Then how come my DDR2 runs at 800 MHz off a 200 MHz FSB? And how do explain that he raised the FSB and didn't mess with dividers and now his memory runs below the stock 800 MHz?

200 quad pumped FSB = 800. 1:1 ratio = 800.

Assuming a 1:1 ratio, you may be running below your RAM's rated speed. For example, if I were to run 350x8, the RAM would run 700, not 800.

Some boards allow dividers, some don't. I prefer 1:1 myself so I could care less.

 

[myocardia]

Originally posted by: inspire
Then how come my DDR2 runs at 800 MHz off a 200 MHz FSB? And how do explain that he raised the FSB and didn't mess with dividers and now his memory runs below the stock 800 MHz?

Because you're the 10 billionth person that has fallen for Intel's lies. And I'm not talking about them lying about performance. They've been lying about their processors' specs since Williamette, IIRC, although since Northwood, for sure. A "1066 Mhz FSB" Conroe doesn't have a 1066 Mhz FSB. But, it's 1066 DDR, so the FSB is DDR 533, right? Wrong, it's 266 Mhz. That's why you only need PC(2) 4200 (266 Mhz) RAM to run 1:1 with a Conroe's FSB, at stock clocks.

I have no idea why they started lying about FSB's, but they did, and it's worked for them for quite a few years now. Anyway, that's about the best that I can explain it, unless you've got a specific question.

 

[stevty2889]

Originally posted by: myocardia

Originally posted by: inspire
Then how come my DDR2 runs at 800 MHz off a 200 MHz FSB? And how do explain that he raised the FSB and didn't mess with dividers and now his memory runs below the stock 800 MHz?

Because you're the 10 billionth person that has fallen for Intel's lies. And I'm not talking about them lying about performance. They've been lying about their processors' specs since Williamette, IIRC, although since Northwood, for sure. A "1066 Mhz FSB" Conroe doesn't have a 1066 Mhz FSB. But, it's 1066 DDR, so the FSB is DDR 533, right? Wrong, it's 266 Mhz. That's why you only need PC(2) 4200 (266 Mhz) RAM to run 1:1 with a Conroe's FSB, at stock clocks.

I have no idea why they started lying about FSB's, but they did, and it's worked for them for quite a few years now. Anyway, that's about the best that I can explain it, unless you've got a specific question.

The FSB is quad pupmped. It can read a single at 4 spots along the sine wave, so even though the base frequency is 266mhz, the effective bus is still 1066mhz. As for the DDR2 800, it's running 1:1 when the FSB is 1600mhz(400mhz quad pumped) DDR2 533 is 1:1 with the defaut 1066mhz FSB(266mhz quad pumped.

 

[imported_inspire]

Originally posted by: Pabster

Originally posted by: inspire
Then how come my DDR2 runs at 800 MHz off a 200 MHz FSB? And how do explain that he raised the FSB and didn't mess with dividers and now his memory runs below the stock 800 MHz?

200 quad pumped FSB = 800. 1:1 ratio = 800.

Assuming a 1:1 ratio, you may be running below your RAM's rated speed. For example, if I were to run 350x8, the RAM would run 700, not 800.

Some boards allow dividers, some don't. I prefer 1:1 myself so I could care less.

This is what I'm getting: "A64 FSB is Quad pumped to calculate memory speed. Intel is only dual-pumped." ???

 

[stevty2889]

Originally posted by: inspire

Originally posted by: myocardia

Originally posted by: inspire
I thought to get Memory BW on DDR2, you multiplied FSB by 4? Or is that just for the A64's? I'm getting 1316 MHz on the memory if I'm right....

Either way, you'll need to boost the memory voltage?

You don't multiply by 4 for any RAM. DDR is DDR, it doesn't matter if it's DDR, DDR2, DDR3, or DDR12. The double is the only part that matters. You're getting 658 on your RAM.

Then how come my DDR2 runs at 800 MHz off a 200 MHz FSB? And how do explain that he raised the FSB and didn't mess with dividers and now his memory runs below the stock 800 MHz?

It's using a ratio higher than 1:1..DDR2-400 runs at 1:1 with a 200mhz FSB..

 

[imported_inspire]

Oh, snap. So, DDR2 gets to 800 MHz by runing a divider higher than 1:1?

 

[phile]

You figure out the FSB:MEM ratio by using the real speeds for FSB and MEM. For instance: DDR2 800 is actually running at a real clock of 400MHz with an effective speed of 800MHz. So, with a FSB of 266 (stock conroe) you would need to run your MEM at DDR2 533 (266 X 2) to avoid using a divider, hence 1:1. If you boost the MEM up to DDR2 800 without overclocking the FSB, you would need to use the 2:3 FSB:MEM divider - 266/400.

With his settings (429 FSB, 1.3625 VCore, 1.55 Northbridge) and the mem modestly overclocked, I would suggest boosting the vcore. 1.36v at 429FSB seems way too low. I could not get my E6600 stable at 333 FSB with anything less than 1.35 vcore.

-phil

 

[markymoo]

you need to check your temperatures first !