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AMD's ATI Radeon HD 4870 1GB Review
Bit-Tech published a review of AMD's ATI Radeon HD 4870 1GB

At anywhere between £187 and £200, including VAT, the Radeon HD 4870 1GB appears to represent pretty good value for money. It's not only cheaper (and better-performing) than the various GeForce GTX 260+ cards on the market, but it's also not that much more expensive than the pre-overclocked GeForce GTX 260s out there as well. In most scenarios, it's actually not too far behind Nvidia's GeForce GTX 280 a card that costs around £80 more.

When you compare it to the Radeon HD 4870 512MB, which retails for around £170 these days, you still appear to be getting a good buy as well. It costs around eight percent more and in some circumstances you're getting performance increases much bigger than that, even at 1,920 x 1,200€ the screen resolution this card looks to be targeting. Of course, there are scenarios where there will be little-to-no benefit, but they're to be expected anyway not all games are completely GPU bound and in those games you'll see very little benefit from a faster graphics card, period.
AMD's ATI Radeon HD 4870 1GB Review

Sapphire Radeon HD 4870 TOXIC 512MB video card review
Elite Bastards posted Sapphire Radeon HD 4870 TOXIC 512MB video card review

In keeping with the rest of their TOXIC range, this offering features increases to both core and memory clock speeds over a reference boards - While the card's RV770 core gets a modest 30MHz boost for a final clock speed of 780MHz, the GDDR5 memory on board gets a more substantial 100MHz increase, with the 1000MHz memory clock offering up some impressive memory bandwidth improvements.

The Radeon HD 4870 TOXIC's cooler also gets a complete overhaul from AMD's reference solution - While it remains a dual-slot affair, the cooler itself is a copper block sporting three heatpipes coupled with numerous aluminium fins, and an 80mm fan on top of it all to provide airflow to the cooler. The Radeon HD 4870 TOXIC also makes use of Vapor-X vapour chamber cooling technology - Its interesting stuff and effective to boot.
Sapphire Radeon HD 4870 TOXIC 512MB video card review