Graphics card ATI 5450 DDR3 -vs- 5550 DDR2 both 1GB

i bought a computer. It said it came with an ATI HD 5450, but it didn't.
Take it back to the store & they offer to install an 5550 cause they don't have a 5450.
I know that the computer says it has a DDR3 RAM & the graphics card was supposed to be (the 5450) a DDR3 bus.
The 5550 graphics card is a DDR2.
Will the 5550 DDR2 graphics card be compatible with the RAM DDR3?
Will it cause problems?
Is the 5550 DDR2 slower than the 5450 DDR3?
any other things I should know / consider?

here's a page with specs on the computer:
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More about graphics card 5450 ddr3 5550 ddr2
  1. The memory on the video card is completely separate from the system memory. It does not need to match. That being said, the 5550 is a few tiers above the 5450 in the Graphics Card Hierarchy Chart, located here.

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