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Bad overclocking on a X1800 GTO...PSU?

post #1 of 5
Thread Starter 
Greetings

I have an sapphire x1800gto and i've discovered that when i overclock the gpu i can go to 612 mhz stable at 1.2 v (74º C on the gpu, 4 hours of atitool with no artifacts). When i overclock the memory i can go to almost 700 mhz @ 2.1 v (495 mhz stock) (i didn't try further). If i put the two of them together (gpu + mem), both atitool and ati tray tools go crazy finding artifacts after a few seconds. It seems my PSU can't handle much... Right now i've to work at 560/612 core/mem @ stock voltages and it seems to be stable (2 hours of atitool scan) .. However ATT still artifacts after 1000 - 1100 seconds.

Could it really be the PSU? I find it strange...550 w and 34 amp in the +12 rail (+12v1=16 amp ; +12v2=18 amp), should do more than enough... The gpu is cooled by an zalman vf700 cu.. so taking the temperature away it only leaves the PSU..right?

Anyway acording to my mobo monitor the +12v rail stays between 11.980 (idle) and 11.750 (running a 3d program)...

What do you think? Thanks!
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6400 Gigabyte GA-965P-DS3 Sapphire Radeon X1800 GTO 2 Gb G.Skill NR 
OSPower
Windows XP LC Power 550 W LC 6550 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6400 Gigabyte GA-965P-DS3 Sapphire Radeon X1800 GTO 2 Gb G.Skill NR 
OSPower
Windows XP LC Power 550 W LC 6550 
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post #2 of 5
Happens with almost every card. My core can run up to 625Mhz alone, and my memory maxes out 840Mhz alone, but if I do it together I can only get 615/820

Don't worry about it.
2 OP pls nerf
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2 OP pls nerf
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post #3 of 5
Quote:
Originally Posted by luismxc
Greetings

I have an sapphire x1800gto and i've discovered that when i overclock the gpu i can go to 612 mhz stable at 1.2 v (74º C on the gpu, 4 hours of atitool with no artifacts). When i overclock the memory i can go to almost 700 mhz @ 2.1 v (495 mhz stock) (i didn't try further). If i put the two of them together (gpu + mem), both atitool and ati tray tools go crazy finding artifacts after a few seconds. It seems my PSU can't handle much... Right now i've to work at 560/612 core/mem @ stock voltages and it seems to be stable (2 hours of atitool scan) .. However ATT still artifacts after 1000 - 1100 seconds.

Could it really be the PSU? I find it strange...550 w and 34 amp in the +12 rail (+12v1=16 amp ; +12v2=18 amp), should do more than enough... The gpu is cooled by an zalman vf700 cu.. so taking the temperature away it only leaves the PSU..right?

Anyway acording to my mobo monitor the +12v rail stays between 11.980 (idle) and 11.750 (running a 3d program)...

What do you think? Thanks!
My oppinion is that the card doesn't receive enough juice. My personal experience, together with what Im reading on the web shows that a card that OCs the GPU and the MEM separate by great margins can't do it simultaneously without a Vmod.

You need to Vmod your memory and maybe the GPU, though I'm a bit concerned that this could lift the temps close to the 90-100°C mark. Try a moderate Vmod on your MEM, than OC the GPU close to the max. With the GPU OCed raise the mem clocks. If the mems goes higher with the Vmod you found your bottleneck. I'm preety sure any GDDR3 with heatsinks on can handle 2.2V
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Centurion
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post #4 of 5
Thread Starter 
Quote:
Originally Posted by The Pook
Happens with almost every card. My core can run up to 625Mhz alone, and my memory maxes out 840Mhz alone, but if I do it together I can only get 615/820

Don't worry about it.
Yes i know... but from 612...to 560?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6400 Gigabyte GA-965P-DS3 Sapphire Radeon X1800 GTO 2 Gb G.Skill NR 
OSPower
Windows XP LC Power 550 W LC 6550 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6400 Gigabyte GA-965P-DS3 Sapphire Radeon X1800 GTO 2 Gb G.Skill NR 
OSPower
Windows XP LC Power 550 W LC 6550 
  hide details  
Reply
post #5 of 5
Thread Starter 
Quote:
Originally Posted by dragosmp
My oppinion is that the card doesn't receive enough juice. My personal experience, together with what Im reading on the web shows that a card that OCs the GPU and the MEM separate by great margins can't do it simultaneously without a Vmod.

You need to Vmod your memory and maybe the GPU, though I'm a bit concerned that this could lift the temps close to the 90-100°C mark. Try a moderate Vmod on your MEM, than OC the GPU close to the max. With the GPU OCed raise the mem clocks. If the mems goes higher with the Vmod you found your bottleneck. I'm preety sure any GDDR3 with heatsinks on can handle 2.2V
But both atitool and ati tray tools allow me to change voltages in memory and on the vpu... my stock voltage on the gpu is 1.075v...beyond 1.2v it seems to afect my overclock in the negative side (at 1.4v the system freezes but my gpu temperature is at 79ºC) I also have to raise the memory voltage from 1.9 to 2.1 for the memory to reach 700 mhz...
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6400 Gigabyte GA-965P-DS3 Sapphire Radeon X1800 GTO 2 Gb G.Skill NR 
OSPower
Windows XP LC Power 550 W LC 6550 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6400 Gigabyte GA-965P-DS3 Sapphire Radeon X1800 GTO 2 Gb G.Skill NR 
OSPower
Windows XP LC Power 550 W LC 6550 
  hide details  
Reply
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