memory clock speed

[4LC4PON3]

i just bought a HIS 4850 found here: http://www.newegg.com/Product/Product.aspx?Item=N82E16814161244

my problem is when i run a game the core goes up to 650 as its supossed to but the memory clock stays at 1000mhz. im running dual monitors. on the second monitor i got GPU-Z and rivatuner running.

looking for any help

my PC isnt the best

dualcore 4450e, 3gb of ram, his 4850, antec earthwatts 430, 640gb sata HD,

 

[defaultluser]

That isn't an error. The memory is running at 1000 MHz, which is 2000 mega-transfers per clock with DDR memory. The clock speed is not really 2000 MHz.

Some ATI cards don't scale the memory clock between idle and load. I imagine you're confused because your memory clock stays the same at idle, but your GPU clock goes down, right?