Newsgroup: it.comp.hardware.video-3d
Titolo: Nvidia GF8600/8500/8300 details

G84 has 32 scalar shaders, G86 has only 16
WE ARE FIVE days from launch of Graphzilla's most important line of products 
for 2007. The 8800 series may have been a success with quite a large stain 
(Vista drivers blunder), but the mainstream and low-end product lines are 
where volume, and thus revenue is made. This is the first article that 
discloses details about 8300, so read on.
For starters, we have to congratulate Graphzilla's engineers, who really 
outdid themselves by creating happy, clockable chips. We are hitting clocks 
of well above 800MHz with bog-standard cooling, which speaks of the 
phenomenal performance of TSMC's 80nm process.
Thanks to the extreme overclockability of the G84 and G86 chips, channel 
partners abandoned Nvidia's own reference designs and pushed forward with 
their own custom products, clocking the GPUs well above reference spec. We 
also got final details about the GPUs themselves, so we'll just give you a 
snip at the final parts, as specified by Nvidia. Bear in mind that partners 
are tweaking things a lot in a bid to differentiate themselves as much as 
possible, but a lot of first and second tier AIBs will come to market with 
products of the following spec.
G84-400/403/405 a.k.a. GeForce 8600GTS comes at a default clock of 675MHz 
for the GPU and 1GHz DDR (2GHz) for GDDR-3 memory. The GPU consists of 289 
million transistors, putting it right in G71, or 7900 territory. These 289 
million transistors are spent on 32 Scalar Shader units clocked at 1.45GHz 
each. Power draw with default clock should not exceed 71 Watts, but 
theoretical headroom is 125-150W (45-75W from PCIe slot, 75W from 6-pin PCIe 
power connector), hence the overclocking competition between the companies.
G84-300/303/305 a.k.a. GeForce 8600GT comes with a near-identical GPU, but 
the clock is different. Thirty-two Scalar Shader units work at 1.18GHz, 
while the rest of the GPU works at 500/550/600 MHz. Video memory is GDDR-3 
and it will be clocked at 700MHz DDR, (1.4 GHz). Power consumption is 43 
Watts, only three Watts more than 8500GT (but overclocking is limited by the 
stable power your motherboard can provide).
G86-300/303/305 a.k.a. GeForce 8500GT is basically half a G84 chip. This el'cheapola 
packs only 16 Scalar Shaders in 210 million trannies, which does not bode 
well for performance in shader-intensive applications. The market will 
decide is this enough. Shader units are clocked at 900MHz, while the rest of 
the chip is set to work at either 450, 500 or even 600MHz, with this last 
being the most used option. Video memory is your typical DDR2 system memory, 
regular PC2-6400 (DDR2-800) memory chips.
G86-303/305 a.k.a. GeForce 8300GTis the only product not launching on April 
17th. This product is set for introduction after AMD launches its R(V)630 
chip, and it is the same chip as one on the 8500GT board. So the GeForce 
8300 will pack 16 Scalar shaders as well (unless nV disables them in 
drivers, but hardware-wise we are talking about the same chip). But, this 
chip will be placed on 7300 PCBs, meaning we have a case of castration. Yes, 
the 8300GT and GS will feature a 64-bit memory interface, so you can guess 
what the performance will be. This baby is packed with either 128MB or 256MB 
of DDR2 memory, again PC2-6400 or something slower. Power envelope is around 
35W, but this depends on the final clock. Nvidia did not set the clock yet, 
because it awaits performance results from AMD's own chips.
It will be interesting to see how Nvidia's simplistic, but highly effective 
scalar design cope with less, but more complex vector units hidden inside 
R610/630/600/650 chips.
For overclockers, there is little or no doubt at all. 8600GTS can be 
overclocked using the shipping single-slot cooler to 750-775MHz with no 
problems at all, putting better air or even water-cooling and eventually a 
voltage-mod will result in clockspeeds of over 1GHz for the core. GDDR-3 
memory performs brilliantly, since you can easily run it at 2.2 or even 
2.35GHz, ending up with bandwidth of 37.5GB/s.

 G86-303/305 a.k.a. GeForce 8300GTis the only product not launching on April 
Si direbbe che manchi all'appello solo una 8700 con 48 shader core.
In ogni caso la situazione si fa abbastanza interessante: secondo queste 
voci le 8600 avranno 32 shader core unificati che, dx10 a parte, le 
rende potenzialmente meno potenti di una Radeon X1900/1950 che ormai ti 
porti via a un prezzo variabile fra i 140 e i 250 euro (con versioni che 
variano da 36 a 48 pixel shader, a cui però si devono aggiungere 8 
vertex shader). Ciò non toglie, tuttavia, che una 8600 venduta intorno 
ai 199 euro sarebbe una scheda interessante.
La 8500 avrebbe 16 shader core, capaci di offrire più o meno le stesse 
potenzialità di una Radeon X1800, sempre dx10 a parte. Davvero niente 
male per una scheda economica, anche se poi bisognerà vedere nel 
complesso - considerando anche il controller della memoria e la memoria 
che ci metteranno sopra - come si comporterà.
p.bes

 Si direbbe che manchi all'appello solo una 8700 con 48 shader core.
Nvidia non li chiama stream processor...? :))

 Nvidia non li chiama stream processor...? :))
si, han coniato un nuovo nome per non chiamarli "shaders semplici capaci di 
un solo scalare per clock"
;) 

 Nvidia non li chiama stream processor...? :))
Li chiamino pure come cazzo hanno voglia, shader core restano.
p.bes


ROTFL!

 ha scritto nel messaggio
news:461eaa81$0$20808$5fc...@news.tiscali.it...

Pure Ati a quanto pare usa il termine stream processor per le VGA di classe
R6xx...:))
E ce ne saranno ben 320 nelle schede di punta :)
http://www.tomshw.it/news.php?newsid=9699
Il termine shader core veniva usato più che altro sulla serie X1000...

 E ce ne saranno ben 320 nelle schede di punta :)
si lo usano come giusta unità di misura
anche se allora dovrebbero chiamarlo Scalar Core :D
cmq il numero 320 mi suona strano, come se R600 avesse 80 US complex 4-way e 
non 64..


Avranno fatto così anche come mossa di marketing, in modo da evidenziare
chiaramente il vantaggio tecnologico rispetto a G80...


da quello che si dice dovrebbero essere 64x5..... :D
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 da quello che si dice dovrebbero essere 64x5..... :D
confermo
anche io ho letto di US vec-5
e tornano anche i conti
STICAZZI :-\

Prova.