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Memtest errors at rated speed = bad ram?

A

Ajax

Weaksauce
Joined
Jun 9, 2004
Messages
65
I've had this corsair ram for a few weeks now and I haven't seen any problems.
It's TwinX1024-4000PRO with the little blinky lights. Anyway, I'm running it fine at 200Mhz FSB (3200) but when I crank it to 250(4000), I get all kinds of errors in memtest86 even on the ram's autodetected default settings.

Currently my system is an abit AN8 and an athlon64 3200+.
I'm running everything at the defaults for my stable system but for ram testing I've dropped the multiplier from 10 to 8 and the HTT link from 5 to 4.

Sound like bad RAM?

Ajax
 
Very often companies do not set SPD exactly as advertised; it is usually more lax to ensure stability, but I have seen a few mistaken sticks where it was set the other way. Try setting your timings to the advertised specs manually and see what happens. Also, try upping the voltage to your processor (and therefore memory controller) a little bit; my 3400+ requires almost 1.7V in order to handle 240MHz RAM, even though its final speed is still 2.4GHz.
 
sticks were set wrong, yes. They were set to 2-3-4-8 instead of 3-4-4-8 which is pretty far off. Still doesn't want to run at 250 with the right timings. I bumped the core up to 1.5 (from 1.4) and i'm running memtest on that box at 240 and not seeing any problems.
I might try 250 again in just a second.
 
well SPD is set to that of their 3200 modules. that's why that's off. it actually says that in their PDFs.
 
running DDRV at 2.75V (as it says in their PDF) at 245 right now, CPU at stock voltage with 3-4-4-8 and memtest isnt complaining.

Still cant get it to go at 250 for some odd reason.
 
SPD can actually be set for multiple speeds, so I'm surprised yours wasn't- very often DDR500 sticks have settings for 400, 433, 466, and 500.
 
It looks like the clockgen on the AN8 might be slightly off. I'm running it at 248 right now and it's working fine but it's saying 248*8=1986 and it should be 1984. It's as if 248=248.25.
Memtest is running fine at this setting so this may be where I clock to.

As far as the SPD settings.. the options I have go from 300 to 400 and nothing above. I guess that's all corsair programmed SPD for.
 
Ajax said:
It looks like the clockgen on the AN8 might be slightly off. I'm running it at 248 right now and it's working fine but it's saying 248*8=1986 and it should be 1984. It's as if 248=248.25.
Click to expand...
Normal. Not even an issue of the clockgen being off, just that they don't bother to show you the fractions/decimals. By the same token, PCI isn't 33MHz- it's ideally 33.3333333333... The same holds true for AGP. When was the last time you saw a chip actually running 200MHz on the FSB or HTT? It's always 200.x
 
that's a good point.
i really shouldnt try to OC when I'm half asleep.
I never did get it to run memtest86 at 250 and at 248 I started seeing errors midway through the test.
I'm wondering if 245 is as high as i'll be able to push that ram.
 
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