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Guest djt01

ATI on its way back?

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Some really nice performance out of a $199.00 card

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Don't hold your breath. The 3870X2 couldn't really hack it in heavy cloud - the 8800GTX left it standing.And with a memory bus of 256-bit I don't expect much from this one. The 8800GTX remains the best card for FSX.

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>Don't hold your breath. The 3870X2 couldn't really hack it in>heavy cloud - the 8800GTX left it standing.>>And with a memory bus of 256-bit I don't expect much from this>one. The 8800GTX remains the best card for FSX.Ditto.Stay away from the 3870X2. Clouds bring it to its knees.

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They fixed the TMU issue with the 3xxx cards which is why they were choking to death in heavy weather.Yes, expect to see its big brother WHOMP the 8800GTX/Ultra but we wont know anything about that for sure until July

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>They fixed the TMU issue with the 3xxx cards which is why they>were choking to death in heavy weather.The other big surprise was the OpenGL performance, a lot different than what we

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I think the latest ATI/AMD video cards have been "almost (great) but not quite".Let's hope this 4xxx series finally does it. If the cpu market isn't close, at least the gpu market could be.RhettFS box: E8500 (@ 3.80 ghz), AC Freezer 7 Pro, ASUS P5E3 Premium, BFG 8800GTX 756 (nVidia 169 WHQL), 4gb DDR3 1600 Patriot Cas7 7-7-7-20 (2T), PC Power 750, WD 150gb 10000rpm Raptor, Seagate 500gb, Silverstone TJ09 case, Vista Ultimate 64ASX Client: AMD 3700+ (@ 2.6 ghz), 7800GT

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Ati is coming back, the 4850 beats the 9800gtx, the 4870 is only going to be better, and the 4870x2 looks like its going to beat the gtx280. I believe ati will be on top soon enough, which is good, we need a new king. ;)

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>They fixed the TMU issue with the 3xxx cards which is why they>were choking to death in heavy weather.>You mean they fixed the TMU issue for the 3xxx cards (driver fix), or only for the 4xxx (hardware fix)?Do you have any additional info (e.g. URL)?Thanks for the clarification.Cheers,-jahman.

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>Ati is coming back, the 4850 beats the 9800gtx, the 4870 is>only going to be better, and the 4870x2 looks like its going>to beat the gtx280. I believe ati will be on top soon enough,>which is good, we need a new king. ;)And it sure looks like I will be using it to replace my 1950Pro !If it overcomes the slowdown with clouds then its sold to me.

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>Don't hold your breath. The 3870X2 couldn't really hack it in>heavy cloud - the 8800GTX left it standing.>>And with a memory bus of 256-bit I don't expect much from this>one. The 8800GTX remains the best card for FSX.Maybe it's the driver and not the card.

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>Ati is coming back, the 4850 beats the 9800gtx, the 4870 is>only going to be better, and the 4870x2 looks like its going>to beat the gtx280. I believe ati will be on top soon enough,>which is good, we need a new king. ;)And along comes the 9800GXT+

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<>Quite possibly but the feedback I was getting from ATI support did not fill me with confidence.And if I was going to get a decent price for the 3870X2 I had to move quickly. The other reason I needed to move quickly was the availability of the 8800GTX.In the end I bought a 8800GTX for the same price I sold the 3870X2 for and it resolved the heavy cloud problem. If ATI have solved it with new drivers then well done but I won't be buying another card until FSXI or if this one fails outside warranty.

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As I posted above its mainly the TMU's the cards do not have. Major quack-up by ATI in the last round of cardsthey fixed that with the 4x seriesI expect the 4870x will be the first card to top the 8800GTX/ULT in FSX if the specs I suspect will hold true.

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>What's a TMU?TMU - Texture Mapping Unit, the GPU component responsible for poor performance rendering clouds in the ATI Radeon HD 3800 series.Cheers,- jahman.

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>>They fixed the TMU issue with the 3xxx cards which>>is why they were choking to death in heavy weather.>>>You mean they fixed the TMU issue for the 3xxx cards>(driver fix), or only for the 4xxx (hardware fix)?>>Do you have any additional info (e.g. URL)?>>Thanks for the clarification.>>Cheers,>>-jahman.Love answering my own questions...According to THG article "(First Look) AMD/ATI RadeonHD 4870" at (nice preview pics!):http://www.tomshardware.tw/574,news-574.htmlThe ATI Radeon 4800 specs are:Radeon HD Units 4870X2* 4870 4850 3870----------------- -------- ------ ----- ----- -----Transistors million 1,930 965 965 666Process nm 55 55 55 55Stream Processors 1,600 800 800 320Texture Units TMUs 80 40 40 16Render Back-Ends 32 16 16 16Core Clock MHz 750 750 625 775Memory Type GDDR 5 5 3 4Memory Clock MHz 900 900 1,000 1,125Memory Rate Gbps ? 3.6 2.0 2.25Math (+ and x) TeraFLOP 2.4 1.2 1.0 0.497* NOTE: The HD4870X2 specs are my *2x extrapolation* of the 4870 specs!So the improvement in 3870 vs. 4870 cloud handling would bedue to an increase in TMUs from 16 to 40 (a 2.5x increase!)Cheers,jahman.

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TMU's are hardware however they can be limited by the manufacturethe 38xx series cards only have 12-16 as I recall and the 4xxx series will have 32

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