Lower max overclock after installing Zalman VF700-Cu?!

ShadowFlare · Jan 13, 2006, 07:04 PM

Three days ago I installed a Zalman VF700-Cu on my Sapphire X800 GTO2. Before installing the Zalman VF700-Cu, the GPU was mostly stable at 540 and wouldn't crash until reaching at least around 560. After installing the Zalman VF700-Cu (with Arctic Silver Ceramique) the GPU will crash on artifact scanning in ATITool as it approaches 530, despite having a lower GPU temperature. My max memory overclock did go up a little, though. I left the existing heatspreader installed and I'm only using half of the ramsinks for now and thinking of possibly putting the rest of them on the heatspreader (http://forums.techpowerup.com/showthread.php?t=8010).

Any ideas on what could have gone wrong such that the temperatue is shown lower, but the max GPU overclock would go down?

Sasqui · Jan 14, 2006, 02:49 AM

I had the same sort of thing happen with one 630 CPU I tried - could get to FSB of 260 on Air (at 60c), but only 250 (at25c) with watercooling... I can't explain it other than some weird thing - like pressure on the IHS or some dielectric phenomenon. The other explaination might be small heat wicking differentails directly above the core. Very wierd. Maybe you'll find something more plausible.

ShadowFlare · Jan 14, 2006, 02:57 AM

Hmm, well the problem seems to have gone away. Maybe it happened because I tried overclocking it the first time I used the card after changing the heatsink/fan. This happened yesterday, which was the first day I used to card after the change, and doesn't seem to be happening anymore today.

Sasqui · Jan 14, 2006, 08:24 PM

Quote:

Originally Posted by ShadowFlare

Hmm, well the problem seems to have gone away. Maybe it happened because I tried overclocking it the first time I used the card after changing the heatsink/fan. This happened yesterday, which was the first day I used to card after the change, and doesn't seem to be happening anymore today.

If you are using Arctic Silver, there is a break in period... possibly the explaintion - after experimatation, my box seems to be improving a MHz at a time each day

Jan 13, 2006, 07:04 PM	#1
ShadowFlare Join Date: Sep 2005 Posts: 541 (0.19/day) Thanks: 0 Thanked 0 Times in 0 Posts System Specs	Lower max overclock after installing Zalman VF700-Cu?! Three days ago I installed a Zalman VF700-Cu on my Sapphire X800 GTO2. Before installing the Zalman VF700-Cu, the GPU was mostly stable at 540 and wouldn't crash until reaching at least around 560. After installing the Zalman VF700-Cu (with Arctic Silver Ceramique) the GPU will crash on artifact scanning in ATITool as it approaches 530, despite having a lower GPU temperature. My max memory overclock did go up a little, though. I left the existing heatspreader installed and I'm only using half of the ramsinks for now and thinking of possibly putting the rest of them on the heatspreader (http://forums.techpowerup.com/showthread.php?t=8010). Any ideas on what could have gone wrong such that the temperatue is shown lower, but the max GPU overclock would go down?

Processor:	Athlon 64 Venice 3200+ 2.0 GHz, max 2.6 GHz with Zalman CNPS7000B-AlCu
Motherboard:	EpoX 9NPA+Ultra nForce4 Ultra with Zalman ZM-NB47J
Cooling:	All Zalman heatsinks (CNPS7000B-AlCu, ZM-NB47J, VF700-Cu)
Memory:	1 GB (2x512 MB) DDR400 Corsair XMS C2 series, max 233 MHz @ 2-3-2-9 1T
Video Card:	Sapphire Radeon X800GTO2 256 MB PCIe max 540/600, modded to 16 pipes
Hard Disk:	Seagate 80GB SATA, Maxtor 160GB PATA, Maxtor 200GB PATA
Optical Drive:	LITE-ON SOHW-1673S DVD+/-RW DL
CRT/LCD Model:	Dell 17" Trinitron CRT
Case:	Lian Li PC-60B Plus
Sound Card:	Built-in Realtek chip
PSU:	Enermax Noisetaker EG495AX-VE, 485 watts, active PFC
Software:	Windows XP Pro SP2, Windows XP Pro x64, Windows Vista RC1 32-bit

System Name:	"Naked Ivy"
Processor:	i7-3570k Costa (4.7 Ghz 24/7), Now de-lidded and NAKED!
Motherboard:	GA-Z77X-UD5H (rev1.1)
Cooling:	SWTech 320 Rad, Modded 655 Pump, Koolance 345
Memory:	16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card:	Powercolor HD 7870 (Core at 1200, 5% bump in voltage)
Hard Disk:	WD 320 / 500KS / 500KS / 640KS / 640LS / 640LS / 640LS / 1TBFAEX
Optical Drive:	LG DVD+-R
CRT/LCD Model:	24" DELL 2405FPW
Case:	Modded HAF 932
Sound Card:	Onboard + HD HDMI
PSU:	Corsair HX750 (love it)
Software:	Win 7 Ultimate
Benchmarks:	Almost stable @ 4.9 Ghz, working on benchies

Processor:	Athlon 64 Venice 3200+ 2.0 GHz, max 2.6 GHz with Zalman CNPS7000B-AlCu
Motherboard:	EpoX 9NPA+Ultra nForce4 Ultra with Zalman ZM-NB47J
Cooling:	All Zalman heatsinks (CNPS7000B-AlCu, ZM-NB47J, VF700-Cu)
Memory:	1 GB (2x512 MB) DDR400 Corsair XMS C2 series, max 233 MHz @ 2-3-2-9 1T
Video Card:	Sapphire Radeon X800GTO2 256 MB PCIe max 540/600, modded to 16 pipes
Hard Disk:	Seagate 80GB SATA, Maxtor 160GB PATA, Maxtor 200GB PATA
Optical Drive:	LITE-ON SOHW-1673S DVD+/-RW DL
CRT/LCD Model:	Dell 17" Trinitron CRT
Case:	Lian Li PC-60B Plus
Sound Card:	Built-in Realtek chip
PSU:	Enermax Noisetaker EG495AX-VE, 485 watts, active PFC
Software:	Windows XP Pro SP2, Windows XP Pro x64, Windows Vista RC1 32-bit

System Name:	"Naked Ivy"
Processor:	i7-3570k Costa (4.7 Ghz 24/7), Now de-lidded and NAKED!
Motherboard:	GA-Z77X-UD5H (rev1.1)
Cooling:	SWTech 320 Rad, Modded 655 Pump, Koolance 345
Memory:	16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card:	Powercolor HD 7870 (Core at 1200, 5% bump in voltage)
Hard Disk:	WD 320 / 500KS / 500KS / 640KS / 640LS / 640LS / 640LS / 1TBFAEX
Optical Drive:	LG DVD+-R
CRT/LCD Model:	24" DELL 2405FPW
Case:	Modded HAF 932
Sound Card:	Onboard + HD HDMI
PSU:	Corsair HX750 (love it)
Software:	Win 7 Ultimate
Benchmarks:	Almost stable @ 4.9 Ghz, working on benchies

Jan 14, 2006, 02:49 AM	#2
Sasqui Eligible for custom title Join Date: Dec 2005 Location: Manchester, NH Posts: 6,041 (2.22/day) Thanks: 814 Thanked 899 Times in 733 Posts System Specs	I had the same sort of thing happen with one 630 CPU I tried - could get to FSB of 260 on Air (at 60c), but only 250 (at25c) with watercooling... I can't explain it other than some weird thing - like pressure on the IHS or some dielectric phenomenon. The other explaination might be small heat wicking differentails directly above the core. Very wierd. Maybe you'll find something more plausible.

Jan 14, 2006, 02:57 AM	#3
ShadowFlare Join Date: Sep 2005 Posts: 541 (0.19/day) Thanks: 0 Thanked 0 Times in 0 Posts System Specs	Hmm, well the problem seems to have gone away. Maybe it happened because I tried overclocking it the first time I used the card after changing the heatsink/fan. This happened yesterday, which was the first day I used to card after the change, and doesn't seem to be happening anymore today.

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