Vista - GTS 250 vs GTS 240

Just wondering how much of a performance difference I would notice between these two cards?

GTS 240 (OEM):
GPU Engine Specs:
Processor Cores 112
Graphics Clock (MHz) 675 MHz
Processor Clock (MHz) 1620 MHz
Texture Fill Rate (billion/sec) 37.8
Memory Specs:
Memory Clock (MHz) 1100 MHz
Standard Memory Config 1 GB GDDR3
Memory Interface Width 256-bit
Memory Bandwidth (GB/sec) 70.4

GTS 250:
GPU Engine Specs:
Processor Cores 128
Graphics Clock (MHz) 738 MHz
Processor Clock (MHz) 1836 MHz
Texture Fill Rate (billion/sec) 47.2
Memory Specs:
Memory Clock (MHz) 1100 MHz
Standard Memory Config 512MB
Memory Interface Width 256-bit
Memory Bandwidth (GB/sec) 70.4
The reason I ask, boils down to $$.

The GTS 240 is pretty much a renamed 9800 GT/GTX (specs are a mix of the two), with the GTS 250 basically a renamed 9800 GTX+.

Some of the reviews here should help,

Video Card Comparison - GPUReview.com

just shave a few FPS off of any of the 9800 GTX numbers, and it should be in the ballpark for what the GTS 240 can do.

yep but a dye shrunk version , the card is only 9" long and needs only 1 power connector