Is this a good over clock for gtx 480 sli watercooled

[GaSChamber89]

core 871 shader 1742 memory 2021 and i never break 71 Celsius i could go higher and maintain temps but i get artifacting could that be PSU problem.

 

[christiangordon]

I would think that your GPU memory is getting to hot.

Please list your system specs. It could be a Power issue.

Do you get the issue when you you lower the core?

 

[GaSChamber89]

System Configuration:
Chassis Model: Special Deal Hot Seller - Black OPS HailStorm Edition
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i7 970 3.2GHz (Six-Core Gulftown)
Motherboard: EVGA X58 SLI 3 Edition (Intel X58 Chipset) (Features USB 3.0 and SATA 6Gb/s) (Model: 131-GT-E767)
System Memory: 6GB DDR3 1600MHz Corsair Dominator GT with DHX Extreme Edition (CMT6GX3M3A1600C7)
Power Supply: 1000W Digital Storm Certified (Dual/Triple/Quad SLI Compatible) (Silent Edition Highly Recommended)
Expansion Bay: - No Thanks
Hard Drive Set 1: Operating System: 1x (80GB Solid State (By: Intel) (Model: X25-M MLC Edition) (Extreme Performance)
Set 1 Raid Options: - No Thanks
Hard Drive Set 2: Multimedia\Data: 1x (1TB Western Digital Caviar (7200 RPM) (64MB Cache) (Model: Black Edition WD1002FAEX)
Hard Drive Set 3: Backup\Misc.: - No Thanks
Optical Drive 1: Blu-Ray & DVD Writer/Reader (Burn + Play Blu-Ray & DVDs) (12x BD-R) (Lite-On iHBS112)
Optical Drive 2: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Video Card(s): 2x SLI Dual (NVIDIA GeForce GTX 480 1.5GB (Includes PhysX Technology)
Add-on Card: - No Thanks
Sound Card: Creative Labs X-Fi Titanium Fatal1ty Professional (PCI-Express Slot Based)
Extreme Cooling: H20: Stage 6: Sub-Zero LCS Dual Loop: CPU & Dual SLI/CrossFire Video Cards & Chipset
H20 Tube Color: White Tubing with High-Performance Fluid (UV Lighting Reactive)
Chassis Airflow: Upgrade Chassis With Zalman Performance Fans (Up to 6 Fans)
Internal Lighting: Internal Chassis Lighting System (UV) (Creates Glowing Effect for H20 Tubes)
Enhancements: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
CPU Boost: FREE: Stage 1: Overclock the processor between 3.3GHz to 3.9GHz (Cooling Upgrade Recommended)
Graphics Boost: FREE: Yes, Overclock the video card(s) as much as possible with complete stability
Memory Boost: - No Thanks, Please do not overclock my memory
OS Boost: FREE: Yes, Disable and tweak all of the non-crucial services on the operating system
Windows OS: Microsoft Windows 7 Home Premium (64-Bit Edition)
Recovery Tools: Advanced Recovery Kit (40GB Hard Drive Partition of Image With OS & Drivers)

it appears it happens more so when the core voltage is lowered. if i raise the voltage then it stabilizes but im running a core voltage of 1138 at the moment and if i push the cards anywhere past what im at i get artifacting but my gpus never break 71 Celsius