GPU overheating

Hello,

For some time now, my graphics card has been shutting down when I play games and the sound freezes, forcing me to reboot my PC.
I searched for the cause of this problem and found it: my GPU's temperature is far too high.
When idle, the temperature ranges between 75° and 80°, and when I watch a movie or video, it exceeds 90°.
I leave it to your imagination what temperatures it can reach when I play a game for more than 15 minutes, hence the crash.

Finally, I come to my question: must I necessarily change my graphics card or is there a way to reduce this temperature for less money?

Properties of my PC during video playback:

Computer:
System type ACPI x64-based PC
Operating System Microsoft Windows 7 Home Premium
System Pack -
Internet Explorer 9.0.8112.16421
DirectX DirectX 11.0

Motherboard:
Processor Type QuadCore Intel Core i5 750, 2800 MHz (21 x 133)
Motherboard Name Acer FMP55
Motherboard Chipset Intel Ibex Peak P55, Intel Lynnfield
System Memory 6135 MB (DDR3-1333 DDR3 SDRAM)

DIMM1: Hynix HMT125U6BFR8C-H9 2 GB DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)

DIMM2: Hynix HMT125U6BFR8C-H9 2 GB DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)

DIMM3: Hynix HMT125U6BFR8C-H9 2 GB DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)
BIOS Type AMI (08/29/09)

Monitor:
Video card NVIDIA GeForce GT 220 (1024 MB)
Video card NVIDIA GeForce GT 220 (1024 MB)
3D Accelerator nVIDIA GeForce GT 220

--------[ Sensor ]----------------------------------------------------------------------------------------

Sensor Properties:
Sensor Type ITE IT8720F (ISA A10h)
GPU Sensor Type Diode (NV-Diode)
Chassis intrusion detected Yes

Temperatures:
Motherboard 22 °C (72 °F)
Processor 31 °C (88 °F)
CPU #1 / Core #1 42 °C (108 °F)
CPU #1 / Core #2 44 °C (111 °F)
CPU #1 / Core #3 44 °C (111 °F)
CPU #1 / Core #4 43 °C (109 °F)
Aux 48 °C (118 °F)
GPU Diode 91 °C (196 °F)
Seagate ST31000528AS 45 °C (113 °F)

Fans:
Processor 1004 RPM
Chassis 1071 RPM
GPU 100%

Voltage Values:
CPU Core 0.88 V
+2.5 V 1.10 V
+3.3 V 3.39 V
+5 V 5.00 V
+12 V 12.03 V
Standby +5 V 4.97 V
Battery VBAT 3.26 V
GPU Core 0.90 V
Debug Info F 02A0 0276 0000 0000 0000
Debug Info T 48 22 31
Debug Info V 37 45 D4 BA BC BB 00 B9 CC

--------[ Motherboard ]----------------------------------------------------------------------------------

Motherboard Properties:
Motherboard ID 64-0100-000001-00101111-082909-LfdHvdImc$926A1P06_BIOS VERSION:P01-A3 RELEASE DATE:08/29/2009
Motherboard Name Acer FMP55

Main Bus Properties:
Bus Type Intel QPI
Actual Clock 133 MHz
Effective Clock 133 MHz
QPI Clock 2394 MHz

Memory Bus Properties:
Bus Type Dual DDR3 SDRAM
Bus Width 128 bits
DRAM:FSB Ratio 5:1
Actual Clock 667 MHz (DDR)
Effective Clock 1333 MHz
Bandwidth 21333 MB/s

--------[ GPU ]------------------------------------------------------------------------------------------

[ PCI Express 2.0 x16: Zotac GeForce GT 220 ]

GPU Properties:
Video Card Zotac GeForce GT 220
BIOS Version 70.16.28.00.15
GPU Codename GT216
PCI Device 10DE-0A20 / 174B-2160 (Rev A2)
Transistors 486 million(s)
Technology Used 40 nm
Internal Size 100 mm2
Bus Type PCI Express 2.0 x16 @ x16
Memory Size 1 GB
GPU Clock Speed (Geometric Domain) 405 MHz (original: 500 MHz)
GPU Clock Speed (Shader Domain) 810 MHz (original: 1200 MHz)
RAMDAC Clock 400 MHz
Pixel Pipelines 8
TMU Per Pipeline 1
Unified Shaders 48 (v4.1)
Hardware Support DirectX DirectX v10.1
Fill Rate (Pixel) 3240 MPixel/s
Fill Rate (Texel) 9720 MTexel/s

Memory Bus Properties:
Bus Type DDR2
Bus Width 128 bits
Actual Clock 324 MHz (DDR) (original: 504 MHz)
Effective Clock 648 MHz
Bandwidth 10.1 GB/s

Usage:
GPU 25%
Memory Controller 14%
Video Engine 0%

nVIDIA ForceWare Clocks:
Standard 2D GPU: 135 MHz, Shader: 270 MHz, Memory: 135 MHz
Low-Power 3D GPU: 405 MHz, Shader: 810 MHz, Memory: 324 MHz
Performance 3D GPU: 500 MHz, Shader: 1200 MHz, Memory: 504 MHz

Thank you in advance for your responses!

Configuration: Windows 7 / Internet Explorer 9.0