Sapphire Xtreme HD5850 wont do 500 mem clock

[sanchaz]

I dont understand, i turn on my computer put the dummy plug in place.
And then i try to downclock my mems and computer crashes.
Anyone had this, how did u solve it?

[sanchaz]

i am using afterburner.

[grue]

i use afterburner, and trixx, both works for me.

[kirby9058]

I dont understand, i turn on my computer put the dummy plug in place.
And then i try to downclock my mems and computer crashes.
Anyone had this, how did u solve it?

Have you tried turning it down in smaller increments? I have an XFX 5830 and I have the same problem on that card when I try and make big jumps. Dunno, it's worth a shot right?

[tito13kfm]

Sneak up on it.  Bring down your memory in small increments with Trixx.  Try 100MHz at a time.

One of my 5830s crashes instantly if I bring it from 1000 to 500, but if I go from 1000 to 900 to 800, etc it's fine.

I have no idea why though.  I do know that I get a HyperTransport error on boot after the crash though.  So it could be too much variance in expected rate through the pci-e slot.

[sanchaz]

yes! its working going down in decrements of 50.
i am using a pci-e 16x at 4x so it might be that.
lets see how far i can lower it.

[sanchaz]

crashed at 550

[sanchaz]

can it be my drivers?
i still have 11.3

btw: it doesnt really crash and reboot windows just freezes.

[tito13kfm]

This is another random/strange suggestion.  First lower your core clock rate down to like 500MHz, then gradually bring memory down, then gradually bring core clock back up.

Drivers should not matter one bit, but you never really know.

[grue]

maybe your card is bad? i can drop the clock to 230 instantly, with no crashes.

[Dyaheon]

Change memory clocks while idling. I believe the 400-600MHz range is unstable for some reason, so if you're idling at 157/300 or whatever clocks, it actually won't change to those values. That way you'll get to skip them and set it to straight to 300 and start mining  

[sanchaz]

maybe your card is bad? i can drop the clock to 230 instantly, with no crashes.

yeah but it seems to work fine at stock clocks, how do i prove to them that its bad?

[EgoPaintedGrey]

My 5850 wont do 500 memclock, so I set it at 700 on MSI AB, then close an reopen MSI and set them at 350. If I set them at 500 it will crash too.

[grue]

maybe your card is bad? i can drop the clock to 230 instantly, with no crashes.

yeah but it seems to work fine at stock clocks, how do i prove to them that its bad?

i meant "bad" as in not good for overclocking, not "broken"

there's nothing you can do about it. maybe you were unlucky and/or i was lucky.

[sanchaz]

My 5850 wont do 500 memclock, so I set it at 700 on MSI AB, then close an reopen MSI and set them at 350. If I set them at 500 it will crash too.

U got it!
thx now hasing
725/300.
just to test out brand new card. will overclock to ~900 after a day or so.

[pun1sh3r]

My 5850 wont do 500 memclock, so I set it at 700 on MSI AB, then close an reopen MSI and set them at 350. If I set them at 500 it will crash too.

Same exact thing happens to me.....works at every other memory clock but 500 lol