According to the brief graphics-card roadmap, we can see that the Radeon HD 4870 X2 will remain the fastest card until, well, some DX11 hardware pops up on the scene. Radeon HD 4870 has already had a price snip and we've seen the HD 4890 come in at around £199 now.
Interestingly, the Radeon HD 4830, which right now is a decent buy at £75-£80, will be shelved and replaced by the all-new Radeon HD 4770 at the crucial $99 price-point.
Via some crude interpretation, the arrow denotes that its performance fits in somewhere between the HD 4830 and HD 4850. Conjecturing somewhat, Radeon HD 4770, ostensibly based on the same core and ramping up clocks via the use of GDDR5 on a mainstream card, should be a good buy for £75.
Excited? We are.