Upgraded GT8600 to GT 440 with new PSU need help

[knightfightx]

Hello.

This is my first question on this community.
2 days ago, my videocard GT 8600 died. I made the choice to buy a new one in a store that is close to where i live.
I think i made mistake with the PSU, and i really hope it is not a huge problem.

I bought a GT 440 1024MB DDR3 PCI-E 2.0.
I also bought with it at the same store a PSU: 370 W PSU big fan.
PSU info:
+3.3V, +5V, +12V, -12V, +5V
14A, 30A, 15A, 0.8A, 2A
180W, 180W, 12W, 10W

Now i replaced my own old PSU for the first time, and it went well!
I now sometimes have problem starting the computer, and i had to start it with my OnBoard videocard a few times to delete some drivers. Now i tried some gaming, like kingdom of amalur, counterstrike, blades of time, it all works perfect except for 1 game, the game i played the most and i love the most, has stopped working.
This game is might and magic heroes VI. When i open the game, the screen shuts itself down for 2-3 seconds, and then i have to close the game with ctrl-alt-del. Then a message appears that the driver display has stopped and recovered with an error on a file named: nvlddmkm. Now i have searched some info, and i found that this is being caused by TDR. It only affects this game i love th most. When i look at the package of my GT 440 it says it needs a minimum of 300W PSU, and i have bought 370W. The problem i saw next was that the GT 440 says it needs 22 Amps on the +12V rail. However, my PSU has only 15 Amps instead of 22 Amps on the +12V rail. Can this be the problem why might and magic isnt working? Is the videocard to much for this PSU i bought?
Can this problem be fixed if i buy a better PSU with minimum 22 Amps on the +12v rail ? It is my first time so i dont know much about PSU. I hope u can help me guys. If u need some more info, i will do my best to provide it.

My computer information:

Motherboard ASUS P5VD2-VM (http://www.asus.com/Motherboards/Intel_Socket_775/P5VD2VM/)
operating System: Windows Vista™ Ultimate (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.111025-0338)
Language: Dutch (Regional Setting: Dutch)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
Memory: 2046MB RAM
Page File: 1206MB used, 3123MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 32bit Unicode

Display Devices
---------------
Card name: NVIDIA GeForce GT 440
Manufacturer: NVIDIA
Chip type: GeForce GT 440
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0DE0&SUBSYS_14413842&REV_A1
Display Memory: 1759 MB
Dedicated Memory: 993 MB
Shared Memory: 766 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor: Acer X233H
Driver Name: nvd3dum.dll,nvwgf2um.dll,nvwgf2um.dll
Driver Version: 8.17.0012.6658 (English)
DDI Version: 11
BGRA Supported: Yes
Driver Attributes: Final Retail

Good day.

 

[GI_JONES]

yes a power supply that provides enough amps will fix your problem

 

[vrumor]

Why would you think it could run on something that doesnt meet the MINIMUM requirements? Im guessing the PSU is also probably not a very good one. Next time buy what you are supposed to and dont make your PSU your biggest budget purchase.

 

[knightfightx]

Well i saw it after i bought it. I only looked at the minimum Watt, not the minimum Amps needed on that trail, as it was my first time. The store wont give me my money back, but i can go back and exchange it for another one. If i add some more money i can get a better one. So all i need to do is buy a better PSU then with a minimum of 22 Amps ? I would also like to know if it is bad for my computer if i play the games that i mentioned above, even thou they work fine, if i dont meet the minimum Amps ?
Is it bad even if i turn on my computer while i dont have the minimum Amps ?
Thank you very much for helping me out!