New Rumor Hints at Interoperability Between Current and Next Generation AMD Videocards

Paul Lilly — Mon, 23 Jun 2008 15:52:13 -0500

AMD surprised the gaming community by releasing its HD 4850 a full week ahead of schedule, and with the HD 4870 only days away from an official debut, it's already too late for an encore. That's okay because AMD might have another trick up its sleeve, this one more surprising than the last.

According to reports, you may be able to mix and match Radeon 4xxx
videocards with the 3000 series. "Since they're both DirectX 10.1
parts, there is no reason why those two should not work together. We
will not qualify this interoperability, but who stops you from trying?," an un-named source close to AMD was quoted as saying, according to Theo Valich at TG Daily.

If true, upgraders won't have to sell, give away, or otherwise retire
their old GPUs, and instead use them together in a CrossFire
configuration. Whether or not pairing a previous generation videocard
with a next generation one ultimately yields a worthwhile performance
boost remains to be seen, and one we'll be sure to update as more
details emerge.

Image Credit: AMD

AMD Radeon HD 3850

Michael Brown — Mon, 14 Jan 2008 18:24:37 -0600

We were so pleased with the price/performance ratio of AMD’s Radeon HD 3870 that we awarded Asus’s implementation of it a 9 Kick Ass verdict in our January 2008 issue. We’re not nearly as impressed with the gaming performance of the architecture’s cheaper cousin, the Radeon HD 3850.

The two GPUs share many features, including the same number of stream processors (320), the same 256-bit memory interface, and AMD’s Unified Video Decoder (for offloading all HD-video decoding from the host CPU). Both parts also provide HDCP support on both DVI links, so Blu-ray and HD DVD movies can be displayed on a 30-inch panel at the screen’s native resolution.

And like the 3870, the cheaper 3850 supports PCI Express 2.0, Direct3D 10.1, and Shader Model 4.0 (none of Nvidia’s GPUs support the latter two features, although it will be a long time before this advantage really means anything). But while the 3870 reference design features 512MB of GDDR4 memory and a dual-slot cooler, the 3850 board we received was outfitted with just 256MB of GDDR3 memory, a single-slot cooler and relatively tame core, and memory clock speeds of 670MHz and 829MHz, respectively.

For gaming, the Radeon HD 3870 was at least competitive with Nvidia’s 8800 GT, but the Radeon HD 3850 is a laggard when it comes to gaming at the native resolution of a 24-inch screen (1920x1200). The frame rates we achieved were roughly half of what we obtained with the 8800 GT. If the 3850 cost half as much as an 8800 GT (average street price: $260), this card would garner a Kick Ass award, but at press time, the average street price for these boards was $190. The extra $70 not only buys a faster GPU, but a frame buffer that’s twice as large.

If gaming isn’t your bag, the Radeon 3850 is a fine GPU for watching high-definition movies. But we prefer videocards that can do it all.

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New Rumor Hints at Interoperability Between Current and Next Generation AMD Videocards

AMD Radeon HD 3850