Can someone explain how temps work for a gpu?

My Computer My Computer

At a glance

Windows 7 ProAthlon II x4 6202gb ddr2 800mhz 6-6-6-16Radeon HD 4850
Computer Manufacturer/Model Number
Me
OS
Windows 7 Pro
CPU
Athlon II x4 620
Motherboard
Gigabyte
Memory
2gb ddr2 800mhz 6-6-6-16
Graphics Card(s)
Radeon HD 4850
Sound Card
Onboard
Monitor(s) Displays
1366 x 768
Hard Drives
WDC Black 500gb
PSU
OCZ ceritified SLI ready 500w
Case
Cool Master Mid tower
Cooling
Stock
didn't i say 4890? i just checked the post and i did :\
 

My Computer My Computer

At a glance

Windows 7Core i7 920 D0Corsair Dominator 1600Geforce GTX 275
OS
Windows 7
CPU
Core i7 920 D0
Motherboard
Rampage II Gene
Memory
Corsair Dominator 1600
Graphics Card(s)
Geforce GTX 275
Sound Card
Auzentech Prelude
Monitor(s) Displays
BenQ G2400WD
Screen Resolution
1920x1200
Hard Drives
WD AAKS 500GB
WD 1TB
Seagate 160GB
PSU
Corsair HX620
Case
NZXT Rogue
Cooling
TRUE Copper
Keyboard
Logitech G15
Internet Speed
Anywhere from 2.5 to 3.5mb

My Computer My Computer

At a glance

Windows 7 ProAthlon II x4 6202gb ddr2 800mhz 6-6-6-16Radeon HD 4850
Computer Manufacturer/Model Number
Me
OS
Windows 7 Pro
CPU
Athlon II x4 620
Motherboard
Gigabyte
Memory
2gb ddr2 800mhz 6-6-6-16
Graphics Card(s)
Radeon HD 4850
Sound Card
Onboard
Monitor(s) Displays
1366 x 768
Hard Drives
WDC Black 500gb
PSU
OCZ ceritified SLI ready 500w
Case
Cool Master Mid tower
Cooling
Stock
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