getting artefacts on 4850

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Davegod

Platinum Member
Nov 26, 2001
2,874
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I've got back into PC gaming with L4D and bought a 4850 but I'm getting graphical artefacts. They're not extensive, mostly I occasionally get blue points on objects, minor glitching, or the tank is green.

I figured overheating but CCC shows healthy temperatures. It was always under 70C at load with stock settings. But anyway I put manual fan speed at 75%, increased my intake case fan (antec tricool, in a P182) speed, cleaned dust filter and put the GPU factory overclock down to stock 625. Load temps are down to 47C according to CCC. But still I get artefacts. I would say there are less artefacts, but I could be kidding myself there.

Any ideas?



PowerColor HD 4850 PCS+ Edition 512MB (currently 625/993; various drivers)
Core2 8400 (stock)
MSI Neo2-FR (P35)
4gb ram
Vista 64
Corsair 650W TX psu
 
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way2fast91

Member
Feb 10, 2009
152
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0
I am not specifically saying this will work for you, but on my Sapphire HD4830, I can oc the gpu to 700 (575 stock) BUT if I bump the memory up more than 25 over stock (900) than I get some mild artifacting. The higher I go on the memory the worse it gets. I am also mostly playing L4D currently.

Any way, I would suggest playing for a bit with the memory at stock clocks and see if that helps at all.

btw- CCC never shows my card above 58C, even after playing L4D all night.
 
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Tempered81

Diamond Member
Jan 29, 2007
6,374
1
81
yah, take your memory down to stock, and then increase core speed til you reach your temp/stability limits.

A slight oc on the memory after that - until you reach the point it wants to artifact.
 
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Davegod

Platinum Member
Nov 26, 2001
2,874
0
76
good point! simply didn't think to downclock the memory, will give it a go at 800 tonight
(my current 993mhz is stock memory speed for a 4850 btw, with most reviews saying cards happily go to 1100mhz and no further)

If this works I'll fiddle upwards until I get to highest stable spot. Not sure I'll have much joy returning the card since I got it at the start of December (only playing games relatively recently). is there something like a quick Prime95 for video cards? Something that doesnt take too long and will report errors afterwards so I can leave it?
 
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Davegod

Platinum Member
Nov 26, 2001
2,874
0
76
no artifacts with memory at 850.
at what point do you guys think it's worth trying for a replacement? Every 10mhz is roughly 1%
 
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Tempered81

Diamond Member
Jan 29, 2007
6,374
1
81
So your memory was running to hot it seems. see how high the core overclocks to. ati tool works great for artifact testing.
 
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Davegod

Platinum Member
Nov 26, 2001
2,874
0
76
got artifacts at 950, though it took a good hour until it happened, and fixed by alt+tabbing out and back. so trying 930 tonight. I must admit surprise if temperatures are the issue, surely memory doesnt have that much of a big temp diff between 850 & 993? plus jacking up the gpu fan and case fan made 20C difference to the core temp but little difference to the artefacting.

core might do ok as core temps are very good even at factory oc of 665.

edit: ATITool site says it doesnt work on vista.
 
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