VisionTek Radeon 7850 2GB DDR5 Upgrade for my Dell XPS 435MT with default PSU, help needed picking the correct PSU please!

[Turns Off Pain]

Greetings comrades, this is my first post though I have been a long time *lurker* here.

The thing is is that I run 12 gigs of gaming ram, 4 quad core i7's, and the problem being is that the default ATI Radeon 4800HD is bottlenecking my FPS/Gaming possibilities.

Therefore I'm upgrading to a "VisionTek Radeon 7850 2GB DDR5" but I have had interest in the following: (Unless someone has a better suggestion in a similar price range).

My problem is that my default Dell XPS 435MT PSU is rated at 300W although it says it can goto 360W. The name of the PSU is a "Liteon RH744"...Regardless I'm certain that this is far to little for what the card I want to be able to work consistently, properly, and also the ram upgrades, fantastic CPU's, and two terabyte HD's can handle.

In conclusion my main problem thus far and even after speaking with the lead Dell tech for 4 HOURS neither of us could find the actual dimensions of the "Liteon RH744" placed in this mini-tower. Therefore I need assistance in the most desperate way to figure out not only what PSU I need that can replace the crap stock model and fit/work properly including providing adequate power to my video card & all other hardware, but also what wattage and additional options (Such as what connectors I'll need to properly use my Video Card and other hardware) from said PSU I should purchase that will run & integrate into my system perfectly.

PS: I originally planned on the: XFX AMD Radeon HD7870 2 GB DDR5 2DVI/HDMI/2x Mini DisplayPort PCI-Express Video Card or the "XFX FX-785A-CNL4 RADEON 7850 860MHz 2GB GDDR5 (Or the best 7850 equivalent, just listed the core as a starting point)". But I have no need, nor never will for additional monitor support for instance... The requirements between these three different cards are vastly different (Including Pricing) but from what I can tell the only difference really being is due to the XFX having so many extra features towards multiple display use and etc, of which I don't need... Am I correct here? All informative replies in this thread I will be grateful for, regardless of if they increase or lower my current plan, in that regard all I ask is to provide solid data and reasons for your differing opinion.

Computer Specs below

-Thank you/Danke SchÖN for your time, I don't want to pressure any of the fine members here but I am on an honest time crunch at the moment, thus the sooner the better.

*SALUTE* -Turns Off Pain-

My computer info:


Operating System System Model
Windows 7 Ultimate (x64) Service Pack 1 (build 7601)
Install Language: English (United States)
System Locale: English (United States)
Installed: 12/24/2011 11:40:21 PM Dell Inc. Studio XPS 435MT
System Service Tag: 5TZ66J1 (support for this PC)
Chassis Serial Number: 5TZ66J1
Enclosure Type: Desktop
Processor a Main Circuit Board b
2.67 gigahertz Intel Core i7 920
64 kilobyte primary memory cache
256 kilobyte secondary memory cache
8192 kilobyte tertiary memory cache
64-bit ready
Multi-core (4 total)
Hyper-threaded (8 total) Board: Dell Inc. 0R849J A00
Serial Number: ..CN736048BL0298.
Bus Clock: 133 megahertz
BIOS: Dell Inc. 1.1.4 12/21/2009
Drives Memory Modules c,d
1640.27 Gigabytes Usable Hard Drive Capacity
740.83 Gigabytes Hard Drive Free Space

DTSOFT Virtual CdRom Device [Optical drive]
DTSOFT Virtual CdRom Device [Optical drive]
DTSOFT Virtual CdRom Device [Optical drive]
PLDS DVD+-RW DH-16A6S ATA Device [Optical drive]

SAMSUNG HD642JJ [Hard drive] (640.13 GB) -- drive 0, s/n S1JNJ90QC17367, rev 1AA01113, SMART Status: Healthy
TEAC USB HS-CF Card USB Device [Hard drive] -- drive 2
TEAC USB HS-MS Card USB Device [Hard drive] -- drive 4
TEAC USB HS-SD Card USB Device [Hard drive] -- drive 5
TEAC USB HS-xD/SM USB Device [Hard drive] -- drive 3
WDC WD1001FALS-00J7B0 [Hard drive] (1000.20 GB) -- drive 1, s/n WD-WMATV0114919, rev 05.00K05, SMART Status: Healthy 12280 Megabytes Usable Installed Memory

Slot 'DIMM1' has 4096 MB (serial number F530321F)
Slot 'DIMM2' has 1024 MB (serial number B8751322)
Slot 'DIMM3' has 1024 MB (serial number A9169708)
Slot 'DIMM4' has 4096 MB (serial number 0B31221F)
Slot 'DIMM5' has 1024 MB (serial number A7169725)
Slot 'DIMM6' has 1024 MB (serial number A716900B)
Local Drive Volumes


c: (NTFS on drive 0) * 623.96 GB 326.78 GB free
d: (NTFS on drive 1) 1000.20 GB 405.40 GB free
e: (NTFS on drive 0) 16.11 GB 8.66 GB free

Controllers Display
ATA Channel 0 [Controller] (2x)
ATA Channel 1 [Controller] (2x)
Standard Dual Channel PCI IDE Controller (2x) ATI Radeon HD 4800 Series [Display adapter]
DELL S2409W [Monitor] (24.0"vis, s/n XX-0M500F-XXXXX-8AV-15RU, October 2008)
Bus Adapters Multimedia
Intel(R) ICH10 Family USB Enhanced Host Controller - 3A3A
Intel(R) ICH10 Family USB Enhanced Host Controller - 3A3C
Intel(R) ICH10 Family USB Universal Host Controller - 3A34
Intel(R) ICH10 Family USB Universal Host Controller - 3A35
Intel(R) ICH10 Family USB Universal Host Controller - 3A36
Intel(R) ICH10 Family USB Universal Host Controller - 3A37
Intel(R) ICH10 Family USB Universal Host Controller - 3A38
Intel(R) ICH10 Family USB Universal Host Controller - 3A39 AMD High Definition Audio Device
HD Pro Webcam C910
High Definition Audio Device

Other Devices:
VIA 1394 OHCI Compliant Host Controller
HID-compliant consumer control device (2x)
HID-compliant device
Ideazon Merc Stealth MM USB Human Interface Device
Ideazon Merc Stealth USB Human Interface Device
Logitech HD Pro Webcam C910
HID Keyboard Device (2x)
Cyborg R.A.T.7 Mouse (HID)
HID-compliant mouse
Programmable Hotkeys
Programmable Root Enumerator
Programmable Support for Keyboard
Programmable Support for Mouse
Generic USB Hub
Logitech USB Camera (HD Pro Webcam C910)
USB Composite Device
USB Mass Storage Device
USB Root Hub (8x)
Generic volume shadow copy
über WALKMENSCH

 

[TheBigTroll]

you want something like this.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

as for the GPU, id suggest getting the 1gb edition. the extra vram doesnt help much

 

[TheBigTroll]

you want something like this.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

as for the GPU, id suggest getting the 1gb edition. the extra vram doesnt help much

 

[Rexer]

Hello.
I too, own a Dell Studio XPS 435mt running a HD7850. I had to upgrade my psu, too. It's also a minitower so space is a premium. I had some problems that came fitting the new combination. I went through 2 power supplies, 3 chipset coolers and added several fans. I even tried to get a HD7950 into it.

First off, if your 435mt has a tall cpu cooler, maneuvering the psu around it takes some minor league skill. I ended up removing it and reapplying the thermo paste. I bought an XFX pro 750 which was sort of big to begin with. For some reason, it generated a lot of heat. Since I wasn't running an sli set up, all the extra power didn't seem necessary. I ended up selling it and purchasing a Seasonic G-650. No heat at all.

It may have been a defective psu, I don't know. Seasonic makes Corair, XFX and a few other psu designs. They're known to best some of the best.

The XFX HD7850 2gb didn't fit right away in the PCIe2 slot. The back edge of the video card hit the I/O inputs on the bottom of the motherboard. I had to remove the fan cover, measured a portion of the cover to be remove then cut it off. It was fine after the surgery, lol.

The setup generated a lot of heat. Don't kid yourself. Consistent high heat isn't good for electronics. Chipset (northbridge) idle temp was 155f to 175f+ full load. I don't think the 435mt was made to handle PCIe3 even though it's compatible*. I replaced the stock heatsink with Silenx IXN-40c and ran the fan directly from the psu. A pcie slot fan was added to also draw the heat away. I added a fan in front again, going directly from the psu. The Dell/Intel 0R849J mobo wasn't made to accommodate extra fans. Adding the extra fans draws the temps down to 108f idle to 126f+ in intense games such as Medal of honor, UT3, BF3.

*Dell hasn't issued any new bios updates since 2009 nor can you adjust the voltages. From time to time, I hear of someone whose tried to upgrade their cpu from an i7 920 to 970 and say they just get a black screen. So basically, the 435mt is a bad dream. You have to figure in Dell is the business of selling computers, so their main interest wouldn't be spare parts or making them last long periods of time.