power supply ?

[kayliss1011]

hi ive got a tagan tg 420-uo1 power supply 22a 12v but i want to buy an 8800gt now ive seen on sever al forums mimimum spec is 400w 22 a on 12v
but all the manafacturers websites seem to say i need 450w+ 26a on 12v.anyone know if i can run an 8800gt on my psu as i cant afford to upgrade both gfx and psu

 

[kayliss1011]

system is amd 64 4400+ dual processor
k8n sli (939 chipset)mobo
2x1g crucual ddr3200
win xp pro
im currently using an 8500 gt 512 i just want a temporary upgrade till i can get a new system later in the summer.
i just dont want to buy a new card and not be able to use it tell i get a new computer

 

[kayliss1011]

great thx for the quick answers is there any 8800gt you recomend i dont have much cash to play with only £100ish