ATi Radeon HD4850 / HD4870 - info, testy, recenze

[blekota je boss]

pekna recenze 4870 & 4850
http://www.anandtech.com/video/showdoc.aspx?i=3341

[no-X]

You'll only be waiting for 2.5 hours.

Random question answering from the thread and notes on things, since I won't have anything for NDA expiry (it's already 2am here, I'm not done, and I have work in the morning sadly):

• FP16 filtering is half speed, and the samplers are limited by available interpolators (only 32 texcoords/clk) when processing INT8 at full speed
• 260mm2, 960M transistors or so
• Huge focus on area efficiency and perf/watt
• Chip was pad limited in the beginning***, so the last couple of SIMDs are value adds that weren't originally planned for. Explains the first point a little bit.
• ROPs are mostly 2x everywhere measured with MSAA and really help the chip go fast. ROP MSAA downfilter this time.
• Seems to be 64KiB L1 per sampler with huge L1 bandwidth, new design
• Finding peak rates everywhere on the chip has been easy. I've seen 1Tflop FP32, full bilinear rates and peak INT8 blend and Z-only writes (64 Zs/clock, yay!)
• GDDR5 is really what lets the chip kick some real ass
• GS perf is up compared to RV670, maybe a new (bigger) coalescing stream out cache there, and more threads in flight
• Colour cache is per ROP, same as R6
• 16KiB per SIMD shared memory + 16KiB global (not the SMX)
• All 800 SPs can do integer, fat one only for specials still. 1 FP32 MAD or 1 FP<->INT or 1 integer op/clock for all
• New caching scheme for the RF I think
• Orlando-led design but very distributed in terms of teams. Scott Hartog led, and he worked on i740 at Intel
• Over 5MiB of SRAM on-chip if you count every pool
• New UVD block with 7.1 over HDMI
• No ring bus MC, new controller nice and efficient due to new ROP design

It's the single most impressive graphics processor (and pairing with a memory technology, nice one Joe!) I've ever seen, when looked at as a whole. I don't say that lightly either, there have been some winning chips over the years.

Deeply impressive and really deserves to get ATI back on the map when it comes to performance 3D graphics. Sorry I won't have anything more filling for arch NDA expiry, go read hardware.fr, Tech Report and Morgoth's pieces if you want more data.

*** ^infinity, that's honestly the best thing ever

....

a ještě něco:

Test: ATi Radeon HD 4850 (CF) und HD 4870

http://www.computerbase.de/artikel/hard ... f_hd_4870/

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a hlavně:

FYI. This is the "96 Shader" chip Orton talked about some time ago. Things change.

[Sinpa]

ATI Radeon HD 4850: technologie, architektura, HD video
http://www.cdr.cz/a/24669

ATI Radeon HD 4850 v testu
http://www.cdr.cz/a/24649

[pivak]

Tak po shlednuti testu mam jasno, jdu do HD4870. Akorat budu nejspis muset posilit zdroj a doufam, ze pozdejsi ovladace neco udelaj se spotrebou v Idle.

Jinak karta na urovni GT260 za mnohem nizsi cenu, kdo by to nekoupil

[spajdr]

HardwareCanucks Radeon 4870 recenze
http://www.hardwarecanucks.com/forum/ha ... eview.html

Hexus Radeon 4870 recenze
http://www.hexus.net/content/item.php?item=13972

[spajdr]

Mimochodem Thermalright HR-03 GT pasuje na 4870ku


Další recenze

Bjorn3D
http://www.bjorn3d.com/read.php?cID=1301

Arstechnica
http://arstechnica.com/reviews/hardware ... review.ars

A vyjádření podpory DX 10.1 od Dave Baumanna

Something that hasn't been noted yet is that EA and SEGA are signed on with us for DX10.1 titles, we've also signed a fairly major deal with Blizzard.

[HrdinaJan]

Myslite, ze ma 4850 i 4870 stejne napeti na jadre, a rozdilne spotreby je dosazeno jenom tim narustem frekvence a treba jeste pametma, ktere by snad meli byt skoro stejne zrave nebo i uspornejsi?

[beardie]

FYI. This is the "96 Shader" chip Orton talked about some time ago. Things change.

trosku naboptnal

no-X: mohol by si pls dopisat nieco k tym predchadzajucim bodom, aby porozumeli aj ti menej zdatni?

[lukas85]

Mimochodem Thermalright HR-03 GT pasuje na 4870ku

Myslíš že by jí byl schopen uchladit i bez 12cm fanu...?

[spajdr]

Mimochodem Thermalright HR-03 GT pasuje na 4870ku

Myslíš že by jí byl schopen uchladit i bez 12cm fanu...?

Určitě ale osobně bych v bedně měl nějaký průvan.

Teď už jenom dořešit tu dostupnost a 4870ka se bude prodávat jak rohlíky v Kauflandu

[izerS18]

Nu co říci. ATI má super karty ted. Bylo na čase

[HrdinaJan]

Ja myslim, ze pasivne ani nahodou, ja mam tenhle chladic na 8800GTX a bez vetraku by to neslo, a to mam bednu slusne resenou. Ten vetrak tam mam 12cm a bezi na 1100ot/min.

Beru to tak, ze ty dve karty maji skoro stejnou spotrebu (8800GTX je OC)

[beardie]

800SP are all fat.

Zaujimave, ze naraz aj pridali tolko SP a este aj rozsirili ich funkcnost, boli pouzite nove kniznice aby to narvali do 260mm^2? (nehovoriac o TMUs)

[Robin_CG]

Ja si musim udelat radost: NVIDIA dostala na prdel jako prase.

Ted jen dostat soucasnou situaci "ATI je nejlepsi uplne ve vsech cenovejch relacich" (4870X2) do povedomi obycejnejch lidi.

[HrdinaJan]

Ja si musim udelat radost: NVIDIA dostala na prdel jako prase.

Ted jen dostat soucasnou situaci "ATI je nejlepsi uplne ve vsech cenovejch relacich" (4870X2) do povedomi obycejnejch lidi.

No zas tak optimisticky bych to nevidel. ATI ma momentalne ''lepsi HW'', ale marketing udela svoje. Momentalni nabidka od zelenych je taky zajimava, o tom zadna. Je spusta lidi co pujdou zelene jen proto ze to tak delaji porad.

[beardie]

pekny popis jadra a porovnanie s R600:
http://www.rage3d.com/reviews/video/ati ... hitecture/

[Kamikadze]

tak uz je i od OBRa, vypada (narozdil od novinek) velmi pekne
Radeony HD4800 - mainstreamové dělo přichází!

[no-X]

Performancerating @MSAA4x na Hardware.fr:



komplet recenze:

http://www.hardware.fr/articles/725-3/d ... -4850.html

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poměr cena/výkon na Hexus.net (2x lepší, než na GTX280 ):



komplet recenze:

http://www.hardware.fr/articles/725-1/d ... -4850.html

[beardie]

800SP are all fat.

Zaujimave, ze naraz aj pridali tolko SP a este aj rozsirili ich funkcnost, boli pouzite nove kniznice aby to narvali do 260mm^2? (nehovoriac o TMUs)

odpoviem si sam, inzinieri ATi niektore casti cipu navrhli rucne a tym optimalizovali priestor

okrem toho su SP a TMUs otocene o 90° (vzhladom na R600), co umozni jednoduchsie pridavanie dalsich SP a TMUs a zostane pomer 4:1 zachovany

[Sentenced]

http://www.anandtech.com/video/showdoc.aspx?i=3341

Sice je tu všeobecny nadšení (na PCT je to celkem běžnej jev) okolo 4850, osobne bych to tak uplne ružove nevidel. Zaplnění tyhle díry trvalo ATi příšerne dlouho a kdo chtel vykonem nad 3870 - musel k zelenym.

Ohledne 4870 uz to vypadá na uplne jiny kafe a i podle toho testu na anandtechu to je celkem zabijácká karta. GTX 260 to poraží na dost místech, je to levnejsi, akorat hlučnost tam zatim neřeší (dost me zajímá) a spotřeba stojí za hovno, jinak dobry.