Im looking to buy a new video card and have decided on the ati radeon hd 4870, but looking at the specs of other video cards under memory clock sometimes i'd see "Memory Clock: 4000mhz", but other times i see it as "Memory Clock:1000MHZ,4.0GBPS" does the 4.0gbps mean 4000mhz? +1000mhz?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102815
this one for example
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102815
this one for example