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Lower max overclock after installing Zalman VF700-Cu?!

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Sep 20, 2005
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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(s) Sapphire Radeon X800GTO2 256 MB PCIe max 540/600, modded to 16 pipes
Storage Seagate 80GB SATA, Maxtor 160GB PATA, Maxtor 200GB PATA
Display(s) Dell 17" Trinitron CRT
Case Lian Li PC-60B Plus
Audio Device(s) Built-in Realtek chip
Power Supply Enermax Noisetaker EG495AX-VE, 485 watts, active PFC
Software Windows XP Pro SP2, Windows XP Pro x64, Windows Vista RC1 32-bit
#1
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?
 
Joined
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Location
Manchester, NH
System Name Working on it ;)
Processor I7-4790K
Motherboard MSI Z97 U3 Plus
Cooling Be Quiet Pure Rock Air
Memory 16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s) Power Color RD Vega 64 Reference
Storage Samsung EVO 500GB / 8 Different WDs / NAS with 2x2Tb WD Black
Display(s) 34" LG 34CB88-P 21:9 Curved UltraWide QHD (3440*1440)
Case Rosewill Challenger
Audio Device(s) Onboard + HD HDMI
Power Supply Corsair HX750 (love it)
Mouse Logitech G5
Keyboard Logitech G710 Blue / G610 Orion Red
Software Win 7 Pro
#2
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.
 
Joined
Sep 20, 2005
Messages
542 (0.12/day)
Likes
0
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(s) Sapphire Radeon X800GTO2 256 MB PCIe max 540/600, modded to 16 pipes
Storage Seagate 80GB SATA, Maxtor 160GB PATA, Maxtor 200GB PATA
Display(s) Dell 17" Trinitron CRT
Case Lian Li PC-60B Plus
Audio Device(s) Built-in Realtek chip
Power Supply Enermax Noisetaker EG495AX-VE, 485 watts, active PFC
Software Windows XP Pro SP2, Windows XP Pro x64, Windows Vista RC1 32-bit
#3
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.
 
Joined
Dec 6, 2005
Messages
9,941 (2.25/day)
Likes
3,895
Location
Manchester, NH
System Name Working on it ;)
Processor I7-4790K
Motherboard MSI Z97 U3 Plus
Cooling Be Quiet Pure Rock Air
Memory 16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s) Power Color RD Vega 64 Reference
Storage Samsung EVO 500GB / 8 Different WDs / NAS with 2x2Tb WD Black
Display(s) 34" LG 34CB88-P 21:9 Curved UltraWide QHD (3440*1440)
Case Rosewill Challenger
Audio Device(s) Onboard + HD HDMI
Power Supply Corsair HX750 (love it)
Mouse Logitech G5
Keyboard Logitech G710 Blue / G610 Orion Red
Software Win 7 Pro
#4
ShadowFlare said:
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 :)