From researching the HD 7750 is an ok low powered GPU for somewhat over $100.
Max TDP: 55 W
I found Newegg is selling 3 Fanless version of the HD 7750http://www.newegg.com/Product/Productco ... -417-02%23
PowerColor Go! Green Radeon HD 7750 AX7750 1GBD5-NH Video Card $119.99 + 6.98 Shipping = $126.97
HIS iSilence Radeon HD 7750 H775P1GD Video Card $117.99 + Free Shipping = $117.99
SAPPHIRE Ultimate Radeon HD 7750 11202-03-40G Video Card $124.99 + 4.99 Shipping (- $10 Rebate) = $119.98
The only one with newegg reviews is the SAPPHIRE version which seems good except for the drivers.
FWIW, My old machine is a 9600 GT: ECS N9600GT-512MX-P GeForce 9600 GT 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card. http://www.newegg.com/Product/Product.a ... 6814134040