One thing i'm slightly confused about....it looks to me like the shader speed is the same as the core clock, is this the case, or are the shaders in a separate clock domain now?
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One thing i'm slightly confused about....it looks to me like the shader speed is the same as the core clock, is this the case, or are the shaders in a separate clock domain now?
Thats the most plausible explanation I've heard so far.Quote:
Originally Posted by MpG
The 1050 core clock was mixed up with the shaders. It was in another language and someone saw 1050mhz and thought that was the core. Core is 850, shaders are 1050. 1000+ shouldnt be too hard though, seing as it has two power plugs at 75w each, plus the 75w from the mobo, so its getting plenty of power. Just need some good cooling, maybe a v-mod.
No hard feelings. :) Oh, guys, first official shots of the 4870X2 have emerged!!! See here:Quote:
Originally Posted by waver_01
http://img249.imageshack.us/img249/2...intowerog1.jpg
lol.
That's cruel yet funny :lol:Quote:
Originally Posted by 003
Perkam
yeah thats cruel how it's so life-threatening to your poor computer!
chasing dust bunnies no doubt!:rofl:Quote:
Originally Posted by 003
Terrible ca(t)ble management :shakes:Quote:
Originally Posted by 003
Can someone please tell me the specs of the 4850, the 4870 and the 4870x2(are they out yet?)? There is too much info on this thread and it will be hard to search all these pages. Thanks
Both HD 4850 & HD 4870:Quote:
Originally Posted by Isaac MM
-RV770 Core (55nm)
-800 stream processors
-32 TMU / 16 ROP
-256 Bit Memory Bus
HD 4850:
-625MHz Core
-512MB GDDR3 @ 2000MHz
HD 4870:
-750MHz Core
-512MB GDDR5 @ 3600MHz
HD 4870 X2
-???MHz Core
-1024MB GDDR5 @ ????MHz
No,Quote:
Originally Posted by Xello
if you say that the data is doubled in the two banks of 512 MB each, then you can think about the two 256 bit bus as one 512 bit bus
No, you can't... it is simply copied individually per-chip across its own individual 256-bit bus to its own bank of 512MB, there is no intercommunication that combines the bandwidths.Quote:
Originally Posted by ORBR
why don'tQuote:
Originally Posted by GoldenTiger
in AFR one bus is used fully with frame A, another with frame B
so why can't I consider this as powerful as one wide bus? ;)
there's no need for intercommunication between the two chip
Yes, but the exact same data is copied on each 256-bit bus, therefore it is not seperate and able to be "added together" and considered a "one wide bus".Quote:
Originally Posted by ORBR
this is false my friendQuote:
Originally Posted by GoldenTiger
each chip write different data on its bus, and you're sure they read the same ONLY if they work on the same (doubled in each memory bank) framebuffer
with AFR they can read slight different assets
and with crossfire you have doubled not only bus and shaders, but buffers TOO, making the way the bus works more efficient
finally I can consider two 256 bit bus as powerful as one 512 bit bus ;)
I HIGHLY suggest you educate yourself before posting such claims that are technically impossible. What you describe is a shared architecture, not a CrossFire/SLI setup.Quote:
Originally Posted by ORBR
fell free to explain and to post evidence before tell at the people "to educate"Quote:
Originally Posted by GoldenTiger
thanks
I think what he is saying is that the 2 cards each have their own 256 bit bus, but because each card is working on its own workload it effectively becomes 512 bits of memory bandwidth.
(Not that its the way i would explain it.)
HD 4870 X2
-775MHz Core
-1024MB GDDR5 @ 3800MHz - 3900MHZ
HD 4850 X2
-600 - 625MHZ core
-1024MB GDDR3 @ 2000MHZ - 2100MHZ
what are you talking about? r700?? :welcome:
hey taof welcome to XS!
yeah its teh rv700
In a perfect world, maybe.Quote:
Originally Posted by ORBR
You see, both GPU's have to store the same information, EVEN IF IT'S AFR mode! Why? Because 99% chance says Frames 1,3,5,7,9, and 11 have 90% the same information(textures, shaders, etc) as 2,4,6,8,10, and 12.
You see, when you run multiple cards, both cards must have all the information in their individual memory banks, as both cards are likely to be showing the same textures as one another, as well as the same shaders. As such, you're effectively doubling the same exact info in both physical memory, as well as using the memory bandwidth of both cards to perform identical tasks. Seeing as how they can't share the same information from the same set of ram, they're effectively doing the same job twice.
As such, it's the same as a single 256bit memory bus, and a single set of 512mb of ram. That's why most stores make sure to specify 256bit x2 and 512mb x2. 2x256bit doesn't equal 512bit. ;)
Sadly in many cases with marketing, the 9800GX2 and 3870X2 are labeled as 1GB 512bit cards. Like you said, most online stores aren't so ignorant but the actual board makers themselves are guilty of this on their own boxes, which I find quite amusing. Obviously it sounds better than just 512x2 but its somewhat dishonest. The funny thing though is the people who buy these cards are usually the people who would know better and aren't impulse buyers ( and usually consumers who've done their research; people don't tend to impulse buy $500-600 video cards without knowing much about them ;) ) Good old marketing departments for you.Quote:
Originally Posted by DilTech
I forgot there will still be 4850X2s as well. Those may turn out to be quite attractive options.
vrzone :
http://forums.vr-zone.com/showthread.php?t=289000
seems fake : 480SP