Need some graphics card advice for using 3D and Adobe

Question

Below are the specs for the workstation I just bought. I'm planning on upgrading the graphics card to a GeForce GTX 570 (Fermi) 1280MB. The chassis is pretty small, and I'm concerned that it might get too hot. Does anyone have any advice as to whether this machine can handle this card, and whether or not I should by extra fans, or a water cooling system for the card? Thanks in advance!
Processor & Memory:
Intel® Core™ i7-2600 Processor (3.40GHz)  
Intel® H67 Chipset  
16GB DDR3 Memory (4 slots, 32GB MAX)
  Drives: 
2TB SATA II Hard Drive  
12X Blu-ray Rewritable Drive: Read AND Write CDs/DVDs/Blu-Ray Discs  
Front Panel 19-in-1 digital multimedia card reader
  Graphics: 
Integrated Intel® HD Graphics (dual monitor capable)
  Communications: 
10/100/1000 Mb/s Gigabit  LAN
  Audio: 
Flexible 8-channel audio with jack sensing
  Keyboard & Mouse: 
USB Keyboard  
USB Mouse
  Expandability (total bays/slots): 
2 x 5.25" external (1 occupied)  
1 x 3.5" external (1 occupied)  
4 x 3.5" internal (1 occupied)  
1 x PCI-Ex16   
2 x PCIe x1
  Ports: 
1x DVI  
1x HDMI  
2 x USB 3.0 ports (rear)  
6 x USB 2.0 ports (2 Front, 4 Rear)  
3 x Audio Ports  
1x S/PDIF out  
1x RJ45
  Operating System: 
Genuine Microsoft Windows® 7 Home Premium, 64-bit
  Additional Software: 
Microsoft® Office Starter (reduced functionality versions of Word and Excel; not the full version of Microsoft® Office 2010)  
Symantec Norton Internet Security 2011 (60-day trial)
  Additional Information: 
Dimensions: (HxWxD):  13.9" x 7.1" x 16.9" (approx.)  
Power supply: 350W  
Lifetime, 24/7 toll-free phone support  
1 Year Limited Parts & Labor Warranty  
Email and fax support M-F from 9am-6pm EST

Answer 1

Here are the major failings of that "workstation":
1) The power supply is much too weak to handle an upgrade to a GTX 570. Heck, that PSU might not have been capable of actually handling even its claimed 350W - but more like 200W. As such, it's barely capable of handling even that "workstation"'s base configuration with integrated Intel HD 2000 graphics. You will definitely need a new power supply (at least 550W, but preferably 750W to 850W) right away before you can even upgrade the graphics card at all.
2) That PC has only one hard disk. Adobe requires a minimum of at least one additional hard disk (preferably two or more additional disks) in order to run Premiere Pro acceptably well.
3) Change out the H67 motherboard for a Z68 motherboard. H67 cannot overclock the "limited-overclockable" i7-2600 CPU at all. And even with a Z68 motherboard, the fastest that you can run that non-K i7-2600 would be 3.9GHz.
4) As you stated, that small case will not be enough. You will need a much bigger case to handle the load from Premiere Pro plus all of the hardware upgrades that I'm suggesting.
Also, keep in mind that the company only offers "lifetime" technical support if you don't tinker with the PC's innards at all - not even a minor hardware upgrade or only for a vendor-approved hardware upgrade such as RAM. Once you open that case for a non-vendor-approved hardware upgrade (e.g. an upgraded power supply, an upgraded GPU or upgraded cooling), you will no longer have technical support from that company that you're getting the PC from.
As currently equipped, that system will run about 25 to 30 times slower than a fast PC. Look at payal's 622-second result running 5.0.3 on the PPBM5 results list, with the same CPU, chipset and integrated graphics as your system: It is already more than 12 times slower (in terms of the Relative Performance Index) than a fast system - and that system is already running two disks. With only one disk for absolutely everything - the OS, media, projects, previews, cache and exports - it would be much slower than even that because SATA is only a half-duplex interface, not a full-duplex interface. As a half-duplex interface, SATA can only deliver data transfers in one direction at a time. However, video editing programs like PPro require simultaneous reads and writes. This means that the single disk must wait for data transfers in a given direction to be completed before any data starts transferring in the opposite direction.