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RV740  (Source: Guru of 3D)

  (Source: Guru of 3D)
Benchmarks place it comfortably between the HD4830 and HD4850

Despite an uncharacteristically tight-lipped stance from ATI on its first 40nm parts, hardware review website Guru of 3D has managed to secure a sample of an RV740-based graphics card and put it through the paces. At first glance, the specifications suggest that it is little more than a shrunken RV770LE core, but a closer look reveals several improvements

According to the preview published today, the GPU boasts 640 shaders, 32 TMUs, and 16 ROPs; all the same as the RV770LE. However, the core and memory clocks both receive a significant bump, up from 575MHz to 650MHz and 1800MHz GDDR3 to 3200MHz GDDR5 respectively. The substantial boost in memory frequency works to offset the performance difference incurred by the smaller 128-bit memory bus on the RV740, which brings the reported math processing rate for the GPU up to 900 GigaFLOPS.

Every single benchmark result published in the review places the RV740-based card right between the existing Radeon HD4830 and HD4850 graphics cards, also from ATI. For example, at 8xMSAA and 16xAF in the popular first person shooter Left 4 Dead, the RV740 turns in 28 FPS, flanked by scores of 25 and 30FPS from the two cards at 2560x1600 resolution. The card does exhibit a significant performance drop at higher resolutions, likely the result of the 128-bit memory bus width and the relatively low 512MB of memory. Other reported benchmarks include Far Cry 2, Crysis WARHEAD, Call of Duty 5: World at War, Brothers in Arms: Hell’s Highway, and 3DMark Vantage.

MSRP for RV740-based graphics cards is expected to be $99 USD, which should make it a very attractive offering in the upper-mainstream segment. While the official name of the video card has not been released, the author of the article suspects it would be called the Radeon HD4750, which would be a logical name for a card with the given characteristics.



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RE: Bandwidth Misconceptions
By davekozy on 2/25/2009 6:02:36 PM , Rating: 3
The 512 bit cards GTX 280 and GTX 285 have 1GB of memory not 512MB. Cards with only 512MB, none of which have a 512 bit bus as far as I know, don't perform well at high resolutions because they don't have enough memory. Not sure how much bandwidth affects performance at high res compared to running out of memory.
128 bit is probably sufficient if you run the memory fast enough. 512 bit 2500MHz DDR3 on the 285 is as much bandwidth as 10000MHz DDR5 at 128 bit!


RE: Bandwidth Misconceptions
By shabodah on 2/25/2009 6:43:52 PM , Rating: 2
Look into some older generation highend cards or workstation cards. Regardless, you are agreeing with me. Even the 2GB GTX285 card is showing significant gains at high resolutions over the 1GB GTX285 cards, and thats with no other variables to account for.


RE: Bandwidth Misconceptions
By The0ne on 2/25/2009 7:35:48 PM , Rating: 2
Or can head over to Anandtech to read one of their latest articles on video card. Multi-GPU and 1Gig+ memory :D

http://www.anandtech.com/video/showdoc.aspx?i=3517


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