The X1300 can be upgraded to a silent HD5450 up to and including the Sapphire HD7750.

All radeons earlier than the 5xxx, 6xxx, 7xxx series are end of life end of support.

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202002

You can get it to work in WIN7 and WIN8 but only 32 bit versions due to WHQL certification required for 64 Bit windows.

All of the X series and radeon 9xxx series are end of life.

     ATI Catalyst™ 10.2 Legacy Display Driver for Windows Vista

support.amd.com/.../radeonaiw_vista32.aspx

The directx june 2010 patch  DXSETUP.EXE should be run after extracting to a folder.  Then the Vista Drivers installed in VISTA Compatability mode.

www.microsoft.com/en-us/download/details.aspx?id=8109) - Microsoft

Note: AMD’s DirectX 9 ATI Radeon graphics accelerators are not officially supported under Windows 7.   If the user chooses to, they can install the ATI Catalyst Windows Vista graphics driver under Windows 7.   Please be aware that none of the new Windows 7 graphics driver (WDDM 1.1) features are supported (as the Windows Vista level graphics driver is limited to WDDM 1.0 level support).  Using the ATI Catalyst Windows Vista driver under Windows 7 is not officially supported by AMD, and as such AMD will not provide any form of customer support for users running in this configuration

AMD has moved a number of DX9 ATI Radeon™ graphics accelerators products to a legacy driver support structure.  This change impacts Windows XP, Windows Vista, and Linux distributions.  AMD has moved to a legacy software support structure for these graphics accelerator products in an effort to better focus development resources on future products.

The following products have been moved to the legacy software support structure (including Mobile and All-in-Wonder Variants):

ATI Radeon 9500 Series

ATI Radeon 9550 Series

ATI Radeon 9600 Series

ATI Radeon 9700 Series

ATI Radeon 9800 Series

ATI Radeon X300 Series

ATI Radeon X550 Series

ATI Radeon X600 Series

ATI Radeon X700 Series

ATI Radeon X800 Series

ATI Radeon X850 Series

ATI Radeon X1050 Series

ATI Radeon X1300 Series

ATI Radeon X1550 Series

ATI Radeon X1600 Series

ATI Radeon X1650 Series

ATI Radeon X1800 Series

ATI Radeon X1900 Series

ATI Radeon Xpress Series

ATI Radeon X1200 Series

ATI Radeon X1250 Series

ATI Radeon X2100 Series

Any customers using a combination of a ATI Radeon™ HD 2000 Series, ATI Radeon™ HD 3000 Series, or ATI Radeon™ HD 4000 Series product with any of the legacy products listed above in a single PC system must use the ATI Catalyst 9.3 or earlier driver.   All future ATI Catalyst™ releases made available past the ATI Catalyst™ 9.3 release will not include support for the legacy products listed above or any of the features associated with those legacy products.

The x1300 was a budget card in its day, and a good budget equivalent is the 6450.

I had two 5450 cards, but they had compatibility issues with some older motherboards. I haven't had any problems with the 6450.

6450 is MUUUCH FASTER than the X1300.

I am having Issues however with Catalyst 12.10 and up.  13.10 crashes on 64 bit windows vista or 7 or 8

never installing.  12.8 seems fine.

Previous Catalyst™ Drivers

It fits in a desktop case but not in an SFF Case. I talked with an engineer about this at work.  While you could CUT

off several inches of the hard drive bracket and use a laptop drive mounted to that bracket it wont fit in the slot as is.

The other mod is to cut off the plastic pins and one of the blue holder pieces for the hard drive and shift it over 1/4 inch away from the slots. In general it does not fit in the SFF.  IT fits fine in the DESKTOP version by moving 2 capacitors slightly left.   Low profile cards with low profile heatsink will fit.

So in conclusion boys and girls it DOES NOT FIT inside the SFF or the USFF.

The USFF because it has no slots.  This first picture is the DESKTOP NOTE THE CDROM COVERS THE HARD DRIVE AND NO OBSTRUCTIONS TO THE LOW PROFILE VIDEO CARD SLOT.

.

Dell™ OptiPlex™ 755 User's Guide

THE PIC BELOW is from a 620 because thats what I have on hand The principle is the same.

Note How LOW PROFILE the heatsink is.

Small Form Factor Computer

Below is how to remove the hard drive.

If you remove the hard drive the ASUS card will go in.  HOWEVER the hard drive will not because it HITS the heatsink.

1. Unpack the replacement hard drive, and prepare it for installation. 
   
   
2. If your replacement hard drive does not have the plastic drive bracket attached, remove the bracket from the existing drive by unsnapping it from the drive. 
   
   

1	release tabs (2)
2	hard drive
3	hard drive bracket

1. Connect the hard drive fan cable to the system board. 
   
   
2. Connect the power and data cables to the drive. 
   
   

1	power cable
2	SATA data cable

1. Check all connectors to ensure that they are properly cabled and firmly seated. 
   
   
2. Gently position the drive until it clicks into place. 
   
   

1	release tabs (2)
2	hard drive

It fits in a desktop case but not in an SFF Case. I talked with an engineer about this at work.  While you could CUT off several inches of the hard drive bracket and use a laptop drive mounted to that bracket it wont fit in the slot as is.

I can confirm that the Sapphire 6570 low profile fits in a GX620 SFF case without modification. I confess I haven't tried a 6450 in this machine, but it's worth it to spend the extra $10 if it will save hacking the case.