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TWIN2x2048 holding back P5WDH?

post #1 of 13
Thread Starter 
Firstly here is the RAM that I have....

http://www.newegg.com/Product/Produc...82E16820145590

Well, my rig is running stable at 400fsb with the RAM set to auto but I can't seem to get the RAM to run at 800mhz no matter what I try.

Previously I'd been running 1:1 with 380fsb but at anything higher and I start getting instablilty.

Is it this RAM thats holding me back? I've been running them at 5-5-5-12 2.1v and still no luck.

At 800mhz I've been able to pass a few runs of memtest but once windows loads I get a ton of errors. Won't prime for more than 1 minute or so.

Any advice guys? Could the RAM be defective? I mean if it can't even run at the advertised speeds then thats terrible for such a pricey ddr2 kit. Should I be thinking RMA?
post #2 of 13
Quote:
Originally Posted by gunner14
Firstly here is the RAM that I have....

http://www.newegg.com/Product/Produc...82E16820145590

Well, my rig is running stable at 400fsb with the RAM set to auto but I can't seem to get the RAM to run at 800mhz no matter what I try.

Previously I'd been running 1:1 with 380fsb but at anything higher and I start getting instablilty.

Is it this RAM thats holding me back? I've been running them at 5-5-5-12 2.1v and still no luck.

At 800mhz I've been able to pass a few runs of memtest but once windows loads I get a ton of errors. Won't prime for more than 1 minute or so.

Any advice guys? Could the RAM be defective? I mean if it can't even run at the advertised speeds then thats terrible for such a pricey ddr2 kit. Should I be thinking RMA?
Bolded statments are most likely your answers if the ram passes in memtest86 and fails prime95 or other benchmark for cpu only odds are you need more vcore on the cpu to make it stable.
    
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post #3 of 13
Agreed. Seems it's not the RAM, since you're passing memtest.
    
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post #4 of 13
Thread Starter 
Thanks for the replys guys.

I've considered more vcore too but I really didn't want to go much higher than 1.5v. I'm at 1.575 now for 400fsb.

THis is the part that's confusing me though, I've been able to run stable for like 8 hours with 1.575 vcore and 400fsb with my RAM at auto. As soon as I bring the RAM to 800mhz then it all falls apart.

Am I over simplifying this? Are there any other settings I should be looking at here? Do I need more vcore for the RAM to run faster?

The RAM has not been totally vindicated either since I've only run memtest for a couple hours at a time. I plan to run it overnight tonight.
post #5 of 13
In cpu-z does it say 1:1 ratio in the memory tab when on auto or is it a divider i.e. 2:1 (2fsb :1ram think i got that rite)? Also what kind of ram do you have in your rig, rated speed @ timings, and vdimm? Personally if the ram can pass a few rounds of memtest (i.e. 5) its stable but thats my opinion. What are your other voltages vfsb, vmch?

As a side note vcore is for the cpu vdimm is for memory
    
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by systemaxd
In cpu-z does it say 1:1 ratio in the memory tab when on auto or is it a divider i.e. 2:1 (2fsb :1ram think i got that rite)? Also what kind of ram do you have in your rig, rated speed @ timings, and vdimm? Personally if the ram can pass a few rounds of memtest (i.e. 5) its stable but thats my opinion. What are your other voltages vfsb, vmch?

As a side note vcore is for the cpu vdimm is for memory

Well, when the RAM is on Auto it says 4:3, (300mhz).

Here is the RAM I'm using

http://www.newegg.com/product/produc...82E16820145590

DDR2 800mhz rated at 5.5.5.12 1.9v.

My cpu is at 400fsb, 1.575vcore (Isn't this a bit too high already?)
PCI Freq 100
PCI Cycle 33.33

FSB Termination 1.4v
MCH 1.65

My RAM settings are 5-5-5-12-4 2.1v.

I'm gonna leave memtest overnight....


Quote:
Originally Posted by systemaxd
As a side note vcore is for the cpu vdimm is for memory
I know but I"m still a beginner so I had to be sure....
post #7 of 13
Ok, so your RAM takes DDR2 400 speeds as default, effectively running at DDR2 600 (400/266*400=600).

Once you put it at 533 in BIOS (533/266*400=800) things go whack.. correct?

The VCore is a little high, but not too high, as long temps are ok (do use TAT or Core Temp to measure).

Since it ran memtest earlier at a lower VCore, I'd back off a little on VCore.
    
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by Chozart
Ok, so your RAM takes DDR2 400 speeds as default, effectively running at DDR2 600 (400/266*400=600).

Once you put it at 533 in BIOS (533/266*400=800) things go whack.. correct?

The VCore is a little high, but not too high, as long temps are ok (do use TAT or Core Temp to measure).

Since it ran memtest earlier at a lower VCore, I'd back off a little on VCore.

The settings in the bios here are a lil different.

With the RAM on Auto at 400fsb it defaults to 300mhz. This is perfectly stable. As soon as I bump the RAM upto 800mhz...bam!

I figure I may be able to reduce the vcore lil and still be stable. Last time I used the TAT load temps were around 57.

I see you have the DFI Infinity, how do you like that board? I almost got that but changed my mind at the last minute.
post #9 of 13
The DFI is quite picky. The lastest official BIOS is sparse (just basic RAM settings). I run it with a Beta BIOS now that allows better RAM tinkering. It's an ok board, but I believe that you did good picking the ASUS.

Oh, and the 300MHz you're talking about and the 600MHz I am talking about are the same. the 300MHz is the external frequency and the 600MHz is the actual DDR2 speed. (twice external).

If yuo try to set the speed at 800MHz in BIOS, no wonder it fails, since the effective speed is then 400/266*800=1200MHz! I do assume you're not doing that. Which setting are you picking in BIOS?
    
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by Chozart

If yuo try to set the speed at 800MHz in BIOS, no wonder it fails, since the effective speed is then 400/266*800=1200MHz! I do assume you're not doing that. Which setting are you picking in BIOS?
Ok, now I am very confused. I am indeed selecting 800mhz in the bios. But CPUZ reports that my RAM is running at 400mhz *2 (of course)so a 1:1 Ratio....

For example, I was able to run at 950mhz in the bios. 475 mhz was reported by cpuz. I actually got a nice performance boost with this setting but I was getting some radom reboots even when browsing. Oddly enough it primed for 10 hours at that setting but still wasn't stable.

I don't think I've gone as high as 1200mhz though, at POST the board tells you what speed your ram is at...eg. PC2 6400, 5700, or 7100 etc.

I'm somewhat happy with this board, 400fsb and 1:1 stable and I'll be very happy indeed. It has soooo many features, pricey though. Has an unpleasant droop as well. I'd never bought a DFI either and so I wasn't too sure about their support and RMA process.
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