250 watts pour un ATi R2900 et AthlonX2 6400+

Bonjour voila mon problème je possède une alimentation de 250 watts(supply tower) et ma question est :
supportera t-il les deux composants donc la puce consomne presque 150 watts et la carte graphique je ne sais pas...

La Carte graphique est un PowerColor ATI Radeon HD 2900 XT 512 Mo DDR3 (dont je ne sais pas combien elle consomne e watt...)

voila ma configuration vérifié sur le site ma-config.com

Version du plugin
2.0.4.10
Système d'exploitation
Windows XP Media Center (build 2600) Service Pack 2
Navigateur web par défaut: Mozilla Firefox
Client e-mail par défaut:
Carte mère
SMBios version 2.4
Packard Bell BV M2N-NVM 1.XX
Bios: Phoenix Technologies, LTD M2N-NVM 0301 06/01/2006 taille: 512Kb
Processeur
AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ (2004Mhz) (L1: 128ko L2: 512ko
)
Chipset
Northbridge: AMD-8131
Southbridge: NVIDIA nForce 410/430 (MCP51)
Mémoire
Barette de 1024 Mo 533 Mhz None
Barette de 1024 Mo 533 Mhz None
mémoire windows (cette valeur ne correspond pas exactement à la mémoire totale
physique): 2046Mo
Lecteurs CD/DVD
Optiarc DVD RW AD-5170A 1.52 (DVD+R/DL Recorder)
MagicISOVirtual DVD-ROM 1.0A (CD-ROM)
Disque dur
ST3160812AS (149.05Go)
ST3160812AS (149.05Go)
Generic USB CF Reader USB Device
Generic USB MS Reader USB Device
Generic USB SD Reader USB Device
Generic USB SM Reader USB Device
Cartes PCI/AGP
Stockage
nVidia Corporation:MCP51 IDE
nVidia Corporation:MCP51 Serial ATA Controller

Affichage
ATI Technologies Inc:RV515 [Radeon X1600]
ATI Technologies Inc:Radeon X1300 Series Secondary

Multimedia
nVidia Corporation:MCP51 High Definition Audio
Philips Semiconductors:SAA7133/SAA7135 Video Broadcast Decoder

Mémoires
nVidia Corporation:C51 Host Bridge
nVidia Corporation:C51 Memory Controller 0
nVidia Corporation:C51 Memory Controller 1
nVidia Corporation:C51 Memory Controller 5
nVidia Corporation:C51 Memory Controller 4
nVidia Corporation:C51 Host Bridge
nVidia Corporation:C51 Memory Controller 3
nVidia Corporation:C51 Memory Controller 2
nVidia Corporation:MCP51 Host Bridge
nVidia Corporation:MCP51 Memory Controller 0

Ponts
nVidia Corporation:C51 PCI Express Bridge: C51 PCI Express Bridge
nVidia Corporation:C51 PCI Express Bridge: C51 PCI Express Bridge
nVidia Corporation:C51 PCI Express Bridge: C51 PCI Express Bridge
nVidia Corporation:MCP51 LPC Bridge
nVidia Corporation:MCP51 PCI Bridge: MCP51 PCI Bridge
nVidia Corporation:MCP51 Ethernet Controller
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] HyperTransport Technology
Configuration: K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] Address Map: K8
[Athlon64/Opteron] Address Map
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] DRAM Controller: K8
[Athlon64/Opteron] DRAM Controller
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] Miscellaneous Control: K8
[Athlon64/Opteron] Miscellaneous Control

Bus Series
nVidia Corporation:MCP51 SMBus
nVidia Corporation:MCP51 USB Controller
nVidia Corporation:MCP51 USB Controller
Texas Instruments:TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)

Périphérique USB
Alcor Micro Corp. 8-in-1 Media Card Reader (USB Reader)
Logitech, Inc. G15 Keyboard
Logitech, Inc. Logitech HID-compliant G5 Laser Mouse (USB Gaming Mouse)
Logitech, Inc. Gaming Keyboard
Clavier
Périphérique clavier PIH
Périphérique clavier PIH
Périphérique clavier PIH
Souris
Logitech HID-compliant G5 Laser Mouse
Ecran(s)
Écran Plug-and-Play( BenQ T705 )

Voila merci de votre aide.