Yeah, the 550VX is a very good PSU.
Here's a quote from nVidia's Web site:
http://www.nvidia.com/object/geforce_8800gt_faq.html
Q: What are the recommended power supply requirements for both the GeForce 8800 GT in single and multi-GPU configurations?
A: GeForce 8800 GT graphics cards require a minimum 400 W or greater system power supply (with 12V current rating of 26 A) for single GPU operation. Please refer to www.SLIZone.com for a list of recommended SLI certified power supplies for multi-GPU configurations.
So yeah, congrats if your 350W PSU can take an 8800GT and an overclocked quad. Others may not be so lucky.
For 8800GT SLI, nVidia's certified PSUs look like this:
http://www.slizone.com/object/slizone_build_psu.html
I pasted the list from a "View source", sorry about all the HTML garbage.
<!-- \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ -->
<!-- For Dual GeForce 8800 GTS, GeForce 8800 GT, or Dual GeForce 7950 GX2-->
<!-- \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ -->
<form name="form2">
<b class="header_green">For Dual GeForce 8800 GTS, GeForce 8800 GT, or Dual GeForce 7950 GX2</b><br>
Choose from the following manufacturers:<br>
<!--<div id="psuB" class="hide">-->
<SELECT name="dual8800gts" onChange="jumpMenu('parent',this,0)">
<option>Please select:</option>
<option value="http://www.amacrox.com/04english/p-freestyle.htm">Amacrox AX750-EP 750W</option>
<option value="http://www.amacrox.com/04english/p-freestyle.htm">Amacrox AX1000-EP 1000W</option>
<option value="http://www.antec.com/us/productDetails.php?ProdID=27100 ">Antec TruePower Quattro 1000 (TPQ-1000)</option>
<option value="http://www.antec.com/us/productDetails.php?ProdID=27850 ">Antec TruePower Quattro 850 (TPQ-850)</option>
<option value="http://www.antec.com/us/productDetails.php?ProdID=23650">Antec TruePower Trio 650W</option>
<option value="http://www.acbel.com/html/products_/newdata/m8power750.htm">AcBel Model PC6018</option>
<option value="http://www.acbel.com/html/products_/newdata/r8power800.htm">AcBel Model PC7030</option>
<option value="http://www.athenatech.us/products/psu/ps-1kwxf.htm">Athenatech PS-1KWXF 1000W</option>
<option value="http://www.atngpower.com.tw/p2-7.htm">ATNG Power APE-1100X(F) APFC 950W</option>
<option value="http://www.atngpower.com.tw/p2-7.htm">ATNG Power APE-1000X(F) PLUS APFC 850W</option>
<option value="http://www.atngpower.com.tw/p2-7.htm">ATNG Power APE-900X (F) PLUS APFC 750W</option>
<option value="http://www.atngpower.com.tw/p2-13.htm">ATNG Power APE-1100FM</option>
<option value="http://www.atngpower.com.tw/p2-13.htm">ATNG Power APE-1000FM</option>
<option value="http://www.atngpower.com.tw/p2-13.htm">ATNG Power APE-900FM</option>
<option value="http://www.bfgtech.com/power_supply_800W.html">BFG Tech PC System Power Supply 800W</option>
<option value="http://www.cwt.com.tw/english/2_product/1_detail.php?ID=922">Channel Well CWT-1200VC</option>
<option value="http://www.cwt.com.tw/english/2_product/1_detail.php?ID=921">Channel Well CWT-1000VC</option>
<option value="http://www.coolermaster.com/index.php?LT=english&Language_s=2&url_place=product&p_serial=RS-A00-ESBA&other_title=RS-A00-ESBAReal%20Power%20M1000">Cooler Master Real Power M1000 (RS-A00-ESBA)</option>
<option value="http://www.coolermaster.com/products/product.php?act=detail&tbcate=22&id=2552">Cooler Master Real Power Pro 750W (RS-750-ACAA-A1)</option>
<option value="http://www.coolermaster.com/index.php?LT=english&Language_s=2&url_place=product&p_serial=RS-850-EMBA&other_title=RS-850-EMBAReal%20Power%20Pro%20850W">CoolerMaster Real Power Pro 850W (RS-850-EMBA)</option>
<option value="http://www.coolermaster.com/index.php?LT=english&Language_s=2&url_place=product&p_serial=RS-A00-EMBA&other_title=RS-A00-EMBAReal%20Power%20Pro%201000W">Cooler Master Real Power Pro 1000W (RS-A00-EMBA)</option>
<option value="http://www.coolermaster.com/products/product.php?act=detail&tbcate=22&id=3143">Cooler Master Real Power Pro 1250W (RS-C50-EMBA)</option>
<option value="http://www.coolmaxusa.com/productDetailsPower.asp?item=CUQ-1350&details=features&subcategory=green&category=green">Coolmax CUQ-1350B 1350w</option>
<option value="http://www.coolmaxusa.com/productDetailsPower.asp?item=CUQ-1200&details=features&subcategory=green&category=green">Coolmax CUQ-1200B 1200w</option>
<option value="http://www.corsair.com/products/tx.aspx">Corsair TX750</option>
<option value="http://www.dynapowerusa.com/product%20htm/05)c_DP-800PL.htm">Dynapower DP-800PL 800W</option>
<option value="http://www.dynapowerusa.com/product%20htm/05)c_DP-900PL.htm">Dynapower DP-900PL 900W</option>
<option value="http://www.dynapowerusa.com/product%20htm/05)c_DP-1000PL.htm">Dynapower DP-1000PL 1000W</option>
<option value="http://www.enermax.com/english/product_Display1.asp?PrID=73">Enermax INFINITI 720 SLI EIN720AWT-00</option>
<option value="http://www.enermax.com/english/product_Display1.asp?PrID=74">Enermax INFINITI 650 SLI EIN650AWT-00</option>
<option value="http://www.enermax.com/english/product_Display1.asp?PrID=76">Enermax Galaxy DXX 850W SLI™ (EGX850EWL-00)</option>
<option value="http://www.enermax.com/english/product_Display1.asp?PrID=75">Enermax Galaxy DXX 1000W SLI™ (EGX1000EWL-00)</option>
<option value="http://us.enlightcorp.com/Product/Product_Detail.aspx?ID=574">Enlight ECP-750AAB A 750W</option>
<option value="http://www.epowertec.com/power_ep-1000p10.html">Epower Xscale EP-1000P10 1000W</option>
<option value="http://www.epowertec.com/power_ep-1000p10.html">Epower Xscale EP-1200P10 1200W</option>
<option value="http://www.etasis.com.tw/ET850.htm">ETASIS ET-850 850W</option>
<option value="http://www.etasis.com.tw/ET750.htm">ETASIS ET-750 750W</option>
<option value="http://www.fspgroupusa.com/everest800.html">FSP Everest 800 800W </option>
<option value="http://www.fspgroupusa.com/epsilon800.html">FSP Epsilon 800 800W </option>
<option value="http://www.fspgroupusa.com/everest900.html">FSP Everest 900 900W </option>
<option value="http://www.fspgroupusa.com/epsilon900.html">FSP Epsilon 900 900W </option>
<option value="http://www.fspgroupusa.com/epsilon1010.html ">FSP Epsilon 1010 1010W </option>
<option value="http://www.fspgroupusa.com/everest1010.html">FSP Everest 1010 1010W </option>
<option value="http://www.fspgroupusa.com/everest800.html">FSP Group Everest 800</option>
<option value="http://www.fspgroupusa.com/BOOSTERX3.html">FSP Group BoosterX 3 (FSP300-1E01)</option>
<option value="http://www.fspgroupusa.com/FX760E.html">FSP Group FX760E 760W</option>
<option value="http://www.fspgroupusa.com/FX700.html">FSP Group FX700-GLN-E 700W</option>
<option value="http://www.fspgroupusa.com/FSP70080GLC.html">FSP Group FSP700-80GLC 700W</option>
<option value="http://www.gigabyte.com.tw/Products/PowerSupply/Products_Spec.aspx?ProductID=2705&ProductName=ODIN%20Pro_1200W">Gigabyte Odin 1200W (GE-MK20A-D1)</option>
<option value="http://www.gigabyte.com.tw/Products/PowerSupply/Products_Spec.aspx?ProductID=2493&ProductName=ODIN%20Pro_800W">Gigabyte ODIN Pro_800W(GE-M800A-D1) 800W</option>
<option value="http://www.gigabyte.com.tw/Products/PowerSupply/Products_Spec.aspx?ProductID=2490&ProductName=ODIN%20GT_800W">Gigabyte ODIN GT_800W(GE-S800A-D1) 800W</option>
<option value="http://www.hec-group.com.tw/model.php?category=psu&sub_category=certified_psu&model=zephyr&rand=851">HEC Group (HEC750DR-AT) 750W</option>
<option value="http://www.hipergroup.com/English/products/hpu-4m880.html">Hiper HPU-4M880</option>
<option value="http://www.hipergroup.com/English/products/hpu-5b680.html">Hiper HPU-5B680</option>
<option value="http://www.hipergroup.com/English/products/hpu-5b880.html">Hiper HPU-5B880</option>
<option value="http://www.hipergroup.com/English/products/hpu-5m730.html ">Hiper HPU-5M730</option>
<option value="http://www.hipergroup.com/English/products/hpu-5k680.html">Hiper HPU-5K680</option>
<option value="http://www.hipergroup.com/English/products/hpu-5k880.html">Hiper HPU-5K880</option>
<option value="http://www.hipergroup.com/English/products/hpu-5b770.html">Hiper HPU-5B770 770W</option>
<option value="http://www.hipergroup.com/English/products/hpu-5k770.html">Hiper HPU-5K770 770W</option>
<option value="http://www.kingwin.com/abt650ma1s.asp">Kingwin ABT-650MA1S 650W</option>
<option value="http://www.kingwin.com/abt700ma1s.asp">Kingwin ABT-700MA1S 700W</option>
<option value="http://www.kingwin.com/abt750ma1s.asp">Kingwin ABT-750MA1S 750W</option>
<option value="http://www.kingwin.com/abt800ma1s.asp">Kingwin ABT-800MA1S 800W</option>
<option value="http://www.kingwin.com/product_pages/abt900ma1s.asp">Kingwin ABT-900MA1S 900W </option>
<option value="http://www.kingwin.com/product_pages/abt1000ma1s.asp">Kingwin ABT-1000MA1S 1000W </option>
<option value="http://www.koolance.com/shop/product_info.php?cPath=28_73&products_id=387">Koolance PSU-1200ATX-12S 1200W</option>
<option value="http://www.listan.net/listan.net/index.php?StoryID=72&GroupID=1884&Level1ID=1960&Level2ID=2506&Level3ID=&ArticleID=2433&websiteLang=en">Listan be quiet! Straight Power BQT E5-700W</option>
<option value="http://www.listan.net/listan.net/index.php?StoryID=72&GroupID=1884&Level1ID=1960&Level2ID=2506&Level3ID=&ArticleID=2432&websiteLang=en">Listan be quiet! Straight Power BQT E5-650W </option>
<option value="http://www.listan.net/listan.net/index.php?StoryID=72&GroupID=1884&Level1ID=1960&Level2ID=2506&Level3ID=&ArticleID=2431&websiteLang=en">Listan be quiet! Straight Power BQT E5-600W</option>
<option value="http://www.nzxt.com/products/pp800/">NZXT PP800 800W</option>
<option value="http://www.nzxt.com/products/precise_1000/">NZXT Precise Power PRC-1000 1000W</option>
<option value="http://www.ocztechnology.com/products/power_management/ocz_gamexstream_power_supply-nvidia_sli_ready_">OCZ Technology GameXStream 850W (FSP850-80GLN)</option>
<option value="http://www.ocztechnology.com/products/power_management/ocz_gamexstream_power_supply-nvidia_sli_ready_">OCZ Technology GameXStream 700W</option>
<option value="http://www.pcpower.com/products/viewproduct.php?show=S75Q">PC Power & Cooling Silencer 750 Quad</option>
<option value="http://www.pcpower.com/power-supply/turbo-cool-860.html">PC Power and Cooling Turbo-Cool 860W</option>
<option value="http://www.pcpower.com/products/viewproduct.php?show=T12W">PC Power & Cooling Turbo-Cool 1200 W</option>
<option value="http://www.pcpower.com/products/viewproduct.php?show=T1KWSR">PC Power & Cooling Turbo Cool 1KW-SR 1000W</option>
<option value="http://www.pcpower.com/products/product_specs.php?show=TC1KW4E">PC Power & Cooling 1KW-Quad SLI (TC1KW4E) 1000W</option>
<option value="http://www.pcpowercooling.com/products/viewproduct.php?show=TC1KW">PC Power & Cooling Turbo-Cool 1KW (TC1KW) </option>
<option value="http://www.pcpowercooling.com/products/viewproduct.php?show=TC1KW4E">PC Power & Cooling Turbo-Cool 1KW-Quad SLI (TC1KW4E)</option>
<option value="http://www.raidmax.com/specs/rx700.htm">Raidmax RX700</option>
<option value="http://www.seasonic.com/product/pc_retail.jsp">Seasonic X900 (SS-900HP) 900W</option>
<option value="http://www.seasonic.com/product/pc_retail.jsp">Seasonic M12-700 700W</option>
<option value="http://www.seasonic.com/letter/products/S12+/pr060830.htm">Seasonic S12 Energy Plus 650W</option>
<option value="http://www.seventeam.com.tw/front/detail.asp?lang=eng&ID=143">Seventeam Electronics Co., Ltd ST-850E-AD 850W</option>
<option value="http://www.seventeam.com.tw/front/detail.asp?lang=eng&ID=150">Seventeam Electronics Co., Ltd ST-1200E-AF 120</option>
<option value="http://www.seventeam.com.tw/front/detail.asp?lang=&ID=144">Seventeam ST-1000E-AD 1000W</option>
<option value="http://www.seventeam.com.tw/front/detail.asp?lang=&ID=130">Seventeam ST-750EAJ 750W</option>
<option value="http://www.sigmaproduct.com/features/sp700_g.htm">Sigma SP-700 70</option>
<option value="http://www.silverstonetek.com/products/p_contents.php?pno=da750&area=usa">Silverstone Decathlon DA750 750W</option>
<option value="http://www.silverstonetek.com/products/p_contents.php?pno=da850&area=usa">Silverstone Decathlon DA850 850W</option>
<option value="http://www.silverstonetek.com/products/p_contents.php?pno=op750&area=usa">Silverstone Olympia OP750 750W</option>
<option value="http://www.silverstonetek.com/products/p_contents.php?pno=op850&area=usa">Silverstone Olympia OP850 850W</option>
<option value="http://www.silverstonetek.com/products/st75zf/st75zf.html">Silverstone Zeus ST75ZF 750W</option>
<option value="http://www.silverstonetek.com/products/st85zf/st85zf.html">Silverstone Zeus ST85ZF 850W</option>
<option value="http://www.highpowersupply.com.tw/?module=products&action=detail&id=14">Sirtec High Power HPC-1000-G14C 1000W</option>
<option value="http://www.sparklepower.com/pdf/SPI900GCM.pdf">Sparkle SPI9000GCM 900W </option>
<option value="http://www.sparklepower.com/pdf/SPI1000GCM.pdf">Sparkle SPI10000GCM 1000W</option>
<option value="http://www.spirecoolers.com/main/product_detail.asp?ProdID=617 ">Spire RocKIT SP-1000W</option>
<option value="http://www.startech.com/Product/ItemDetail.aspx?productid=EPSPOW750PRO&c=CA">StarTech.com WattSmart 750W EPS12V Ver 2.91 80 PLUS</option>
<option value="http://www.startech.com/Product/ItemDetail.aspx?productid=EPSPOW850PRO&c=CA">StarTech.com WattSmart 850W EPS12V Ver 2.91 80 PLUS</option>
<option value="http://www.startech.com/Product/ItemDetail.aspx?productid=EPSPOW650PRO&c=CA">Startech WattSmart 650W EPS12V Ver 2.91 80 PLUS</option>
<option value="http://www.super-flower.com.tw/products_detail.asp?products_id=195">SuperFlower Aurora PSU (SF-800R14A) 800W</option>
<option value="http://www.super-flower.com.tw/products_detail.asp?products_id=194">SuperFlower Aurora PSU (SF-750R14A) 750W</option>
<option value="http://www.super-flower.com.tw/products_detail.asp?products_id=193">SuperFlower Aurora PSU (SF-700R14A) 700W</option>
<option value="http://www.tacens.com/supero1000.htm">TACENS Supero 1000W</option>
<option value="http://www.tacens.com/supero700.htm">TACENS Supero 700W</option>
<option value="http://www.tacens.com/supero600.htm">TACENS Supero 600W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=175&p_cata_id=109">Tagan BZ ESA 1300W</option>
<option value="http://www.tagan.de/pages/products/dual_Engine/e_tg700_u25.html">Tagan TG-700-U25 700W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=156&p_cata_id=66">Tagan TG700-U33 ITZ 700W</option>
<option value="http://www.tagan.de/pages/products/easyconXl/e_tg700_u35.html">Tagan TG-700-U35 700W</option>
<option value="http://www.tagan.de/pages/products/dual_Engine/e_tg800_u25.html">Tagan TG-800-U25 800W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=155&p_cata_id=83">Tagan TG-800-U33 ITZ 800W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=70&p_cata_id=64">Tagan TG-900-U95 900W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=109&p_cata_id=64">Tagan TG-900-U96 900W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=154&p_cata_id=64">Tagan TG-900-U33 ITZ 900W </option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=174&p_cata_id=63">Tagan TG-1100 BZ 1100W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=176&p_cata_id=63">Tagen TG-1100 BZ ESA 1100W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=86&p_cata_id=63">Tagan TG-1100-U95 1100W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=58&p_cata_id=63">Tagan TG-1100-U96 1100W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=153&p_cata_id=63">Tagan TG-1100-U33 ITZ 1100W</option>
<option value="http://www.tagan.com/index.php?c_id=32&products_id=152&p_cata_id=109">Tagan TG1300-U33 1300W</option>
<option value="http://www.thermaltake.com/product/Power/PurePower/w0177/w0177.asp">Thermaltake Purepower W0177 RX 750AP 750W</option>
<option value="http://www.thermaltake.com/product/Power/ToughPower/w0171/w0171.asp">Thermaltake Toughpower 1500W (W0171)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0133/w0133.asp">Thermaltake Toughpower 1200W (W0133)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/w0155/w0155.asp">Thermaltake Toughpower 1000W (W0155)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0131/w0131.asp">Thermaltake Toughpower 850W (W0131)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0117/w0117.asp">Thermaltake Toughpower 750W (W0117)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0106/w0106.asp">Thermaltake Toughpower 700W (W0106)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0104/w0104.asp">Thermaltake Toughpower 650W (W0104)</option>
<option value="http://www.thermaltakeusa.com/product/Power/PurePower/w0144/w0144.asp">Thermaltake Toughpower 600W (W0144)</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0131/w0131.asp">Thermaltake Toughpower W0131RU 850W</option>
<option value="http://www.thermaltake.com/product/Power/ToughPower/W0131/w0131.asp">Thermaltake Toughpower 850W (W0131)</option>
<option value="http://thermaltakeusa.com/product/Power/ToughPower/W0172/w0172.asp">Thermaltake Toughpower 850W (W0172)</option>
<option value="http://www.thermaltake.com/2005/purepower/w005758twv500/w005758twv500.htm">Thermaltake PurePower TWV500W</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0106/w0106.asp">Thermaltake ToughPower 700W</option>
<option value="http://www.thermaltakeusa.com/product/Power/ToughPower/W0117/w0117.asp">Thermaltake ToughPower 750W</option>
<option value="http://www.topower.com/pwr_top_1000W.html">Topower/ePower TOP-1000W</option>
<option value="http://www.ultraproducts.com/product_details.php?cPath=52&pPath=632&productID=632">Ultra Products X3 1000 Watt (ULT40064)</option>
<option value="http://ultraproducts.com/product_details.php?cPath=52&pPath=548&productID=554">Ultra Products ULT-XP750APFC 750W</option>
<option value="http://ultraproducts.com/product_details.php?cPath=52&pPath=548&productID=548">Ultra Products ULT-XF800APFC 800W</option>
<option value="http://www.ultraproducts.com/product_details.php?cPath=52&pPath=383&productID=538">Ultra Products X-Finity 800W</option>
<option value="http://www.xclio.com/product/PSU_GreatPower/x14-650w.htm">XClio GreatPower X14S4P4 650W</option>
<option value="http://www.xclio.com/product/PSU_GreatPower/x14-700w.htm">XClio GreatPower X14S4P4 700W</option>
<option value="http://www.xclio.com/product/PSU_GreatPower/x14-750w.htm">XClio GreatPower X14S4P4 750W</option>
<option value="http://www.xigmatek.com/product/power-nrphc1001.php">Xigamtek NRP-HC1001 1000W</option>
<option value="http://www.xigmatek.com/product/power-nrphc1201.php">Xigamtek NRP-HC1201 1200W </option>
<option value="http://www.xigmatek.com/product/power-nrphc1501.php">Xigamtek NRP-HC1501 1500W </option>
<option value="http://www.zalman.co.kr/eng/product/view.asp?idx=322&code=015">Zalman ZM750-HP</option>
<option value="http://www.zalman.co.kr/eng/product/view.asp?idx=321&code=015">Zalman ZM850-HP</option>
<option value="http://www.zalman.co.kr/eng/product/view.asp?idx=335&code=015">Zalman ZM1000-HP 1000W</option>
<option value="http://www.zippy.com/P_product_detail.asp?lv_rfnbr=2&pp_rfnbr=1340&pcp_rfnbr=20&pp_name=Gaming?PSL-6850P(G1)&pcp_name=gaming%20power&pcpw_rfnbr=6&pp_code=Gaming?PSL-6850P(G1)">Zippy Gaming PSL-6850P(G1)</option>
<option value="http://www.zippy.com/P_product_detail.asp?lv_rfnbr=2&pp_rfnbr=1373&pcp_rfnbr=20&pp_name=Gaming?PSL-6850P(G1)-PCIE4&pcp_name=gaming%20power&pcpw_rfnbr=6&pp_code=Gaming?PSL-6850P(G1)-PCIE4">Zippy Gaming PSL-6850P(G1)-PCIE4</option>
<option value="http://www.zippy.com.tw/P_product_detail.asp?lv_rfnbr=2&pp_rfnbr=1383&pcp_rfnbr=20&pp_name=Gaming?PSL-6800P(G1)-PCIE4&pcp_name=gaming%20power&pcpw_rfnbr=6&pp_code=Gaming?PSL-6800P(G1)-PCIE4">Zippy Gaming PSL-6800P(G1)-PCIE4 800W</option>
<option value="http://www.zippy.com.tw/P_product_detail.asp?lv_rfnbr=2&pp_rfnbr=1339&pcp_rfnbr=20&pp_name=Gaming?PSL-6800P(G1)&pcp_name=gaming%20power&pcpw_rfnbr=6&pp_code=Gaming?PSL-6800P(G1)">Zippy Gaming PSL-6800P(G1) 800W</option>
<option value="http://www.2themax.com/power_mp_sp.html">2theMax (Topower) SP-1200</option>
<option value="http://www.2themax.com/power_mp_rf_extreme.html">2theMax (HEC) RF Extreme 750 750W</option>
</select><br>
FSP Group BoosterX 3 (FSP300-1E01) - not certified for Dual GeForce 8800 GTS
</form>
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They range from 650W to 1500W. The Silencer 750W is on the list. I can also guarantee it's a quiet and reliable PSU, since I own one. More details here:
http://www.tomswiki.com/page/Tiered+PSU+Listings
http://anandtech.com/casecoolingpsus/showdoc.aspx?i=3186&p=2
Anyway, TBH I couldn't care less what PSU the OP buys. I don't sell PSUs for a living, and I don't get commissions from PC P&C. If he wants a 350W PSU and it works, I'd be very happy to hear details and I'll personally recommend that particular type of PSU to everybody