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#AMD RADEON HD 3870 512MB PRICE FULL#
#AMD RADEON HD 3870 512MB PRICE PRO#
#AMD RADEON HD 3870 512MB PRICE SERIES#

It is worked out by multiplying the card's bus width by its memory speed. It’s a nice feather in AMD’s cap to be the first to support it, but don’t let it be a big factor in your buying decision.Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. In most cases, you’ll hardly be able to see any difference between them (the DX10.1 version might run slightly faster, or have a better anti-aliasing option, for example). DX 10.1 makes some of the things that were optional in DX10 mandatory (like 32-bit texture filtering), and it adds a few new nice little wrinkles that could be of use to developers, but it’s certainly not going to be “the next big thing.” We don’t expect many games to support DirectX 10.1 for awhile yet, and all the games that do will also support regular DX10. Needless to say, this chip should be far more affordable to produce, run cooler, and use less power.Ī quick word about DirectX 10.1, which is coming to Vista users with Service Pack 1 early in 2008: While this is the first chip to support the new API standard, and AMD is likely to make a big deal about that, you shouldn’t really get too excited. R600 was a monster of a chip, 408mm 2 on an 80nm process. Some general design efficiencies and a reduced-size UVD engine make up the rest of the difference. Much of the lost transistors are due to the 256-bit memory interface (a 512-bit “ring interface”), where the R600 chip’s interface was twice as wide. The end user won’t really see much of a difference, though.ĭespite these changes, the transistor count of the chip has actually gone down from around 700 million in the R600 to 666 million in RV670. Tunes the UVD engine to offer better performance while reducing the number of transistors.This may be noticed in a small improvement to performance when enabling anti-aliasing.

Improves efficiency by tweaking the render back-ends.

Offers better arbitration in the memory controller when different parts of the chips make requests.

Improves cache efficiency, particularly when making lots of small requests.

Reduces power consumption when idle and especially during “light usage” scenarios, such as when rendering Vista’s 3D desktop, thanks to an improvement to “PowerPlay.”.

Supports DirectX 10.1, including Shader Model 4.1, mandatory FP32 filtering, mandatory 4x multisample AA with samples exposed to shaders, index-able cube maps, etc.

#AMD RADEON HD 3870 512MB PRICE FULL#

It handles full entropy decode of both H.264 and VC-1.

#AMD RADEON HD 3870 512MB PRICE PRO#

Incorporates the UVD video decoder found in Radeon HD 24 cards, but not in the 2900 Pro and XT.

Though it appears at first glance to be an R600 with half the memory interface, the RV670 chips have incorporated several enhancements: The ASUS brand card we’re reviewing is a dual-slot card, and there are others, but we’re told some vendors will offer single-slot variants as well.

This is the card meant to offer equivalent performance to the Radeon HD 2900 XT-only at barely more than half the cost and half the power utilization. It’s equivalent to an “XT” model in the old scheme.īefore we get into the specific differences between this RV670 and the R600, let’s look at some relevant speeds and feeds: So the Radeon HD 3870 is the third GPU generation, 8-series, 70-variant. The first denotes the GPU generation, the second the card family, and the last two the particular variant. From now until the foreseeable future, the plan is to have all cards branded with a four-digit number. First, a note on naming conventions.ĪMD is thankfully getting rid of all this “XT” and “Pro” and “GT” business in their naming conventions. RV670 brings with it several enhancements to the R600 core, which we’ll detail in a moment.

#AMD RADEON HD 3870 512MB PRICE SERIES#

Suffice it to say you should read that article if you need a refresher on AMD/ATI’s 6xx series DX10 graphics architecture. The base architecture is the same, and we won’t dive into all that right now because we wrote exhaustively about it earlier this year. The RV670 chip powering the Radeon HD 38 cards is not identical to the R600 found in the Radeon HD 2900 XT, only at 55nm. This site may earn affiliate commissions from the links on this page.