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ATI HD5XXX Series Discussion

Bo_Fox

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i thought w1z kinda clarified that memory bus width isn't limited by memory chips but the number of ROP's. I personally don't think they went 512-bit via ring bus for the HD 5870 as every rumor released so far has stated a 256-bit. Though i could see them using one when GT300 is released to help compete.
Largon already said that 16 memory chips is definitely needed for 512-bit memory bus, as each chip is limited to a 32-bit wide interface.

All W1z literally said was that a GPU has a number of ROP's that is directly tied to a certain bus-width memory interface... just like with a GTX 275 that has 28 ROP's and 448-bit bandwidth and a GTX 285 that has 32 ROP's and 512-bit bandwidth. But then again, Largon could be correct in that a (512-bit or 1024-bit) ringbus changes this, since ATI did 512-bit memory with only 16 ROP's and a ringbus.
 

W1zzard

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Of course. BUT considering the fact my reply countered this:
My point stands. The only requirement is a sufficient die dize to fit the numerous amount of I/O pads for 512bit GDDR5, and ROPs - unless the chip has a ringbus.
you are correct of course. you can "join" as many chips together as you want to achieve whatever bus width you need.
 
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And die size. Or rather, the length of the perimeter, that is, the outer edge of the chip. IO pins can only be placed on the edge so a 512bit bus requires a big die to have enough perimeter. GDDR5 especially, requires a big die as the chips have 25% more pins compared to GDDR3/4. Even RV870 with it's over 300mm² size is simply too small for a 512bit bus - but I'm sure nV has no problems creating a die big enough.
Hmmmm, doesn't GDDR5 use less pins then 3 or 4 allowing for fewer pins and fewer traces on the boards and making them cheaper for AIB partners?

Anyone think the 5870x2 will have the cooling problems like the 4870x2? I love mine, just wish I could push the clocks higher. Maybe about tax time I'll move over. It will either be a 5870x2 or 2x 5870s.
 
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Largon already said that 16 memory chips is definitely needed for 512-bit memory bus, as each chip is limited to a 32-bit wide interface.

All W1z literally said was that a GPU has a number of ROP's that is directly tied to a certain bus-width memory interface... just like with a GTX 275 that has 28 ROP's and 448-bit bandwidth and a GTX 285 that has 32 ROP's and 512-bit bandwidth. But then again, Largon could be correct in that a (512-bit or 1024-bit) ringbus changes this, since ATI did 512-bit memory with only 16 ROP's and a ringbus.
i wasn't talking number of chips, i meant that what i got from w1z's post was that a bus width isn't limited by the type of chips: GDDR3, 4, 5, etc. Though i musta missed the post bout 16 chips being required for a 512-bit bus
 
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Hmmmm, doesn't GDDR5 use less pins then 3 or 4 allowing for fewer pins and fewer traces on the boards and making them cheaper for AIB partners?
Modern GDDR3/4 has 136pins, GDDR5 on the other hand has 170.
But you're actually right - GDDR3 has 69 I/O pins (you made me count them :p), and out of the 170 pins on GDDR5 there's just 63 I/O pins. So GDDR5 does infact have less pins when you look at it from the memory controller's POV. The total pin premium of GDDR5 is explained by the 100 power/ground pins and 7 other (nonconnected, etc.) pins. GDDR3/4 has just 64 power pins and 4 other pins.
 

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Here be the backplate. The card finally looks good in a case:

 
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So the holes are just decorative :wtf:
 
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That is a nice looking piece of kit!

Huge though, I'm going to have to rearrange my Antec ( rig its going in til I build my own)

And then cut out some of the HDD cage on my new case XD
 
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Card length




If true, the 5870x2 is going to be a very long card.
 
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Anyone else going to mod their case just to fit this in? :D
 
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What's the card length of the 4870?

I think I'm going to go with two of those to help with cooling which should be better than the 5870x2. Besides, it shouldn't be slower than my 4870x2 and more than likely will be faster in most games. That and having a board with two pcie slots helps too.
 
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My XFX 4870 ( that I had for 2 days ;) )

was about 24 cm long..

I think I might actually have just about enough room for the card without modding, thanks to the PCI-E power being on the side, I shall go measure things.
 
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Maybe i will mod my case or buy CM HAF922 if i have cash.
And btw the card is 28cm long... It's ridiculous :twitch:

 
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I am really thinking about selling my kidney, so i can buy one of these! ;)
 
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The 5870 is 28cm?

BTW, if you got a Microcenter around they have a rebate on the 922 making it ~$75 before tax.
 
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I knew I was going to upgrade to a Full Tower for more than just airflow :)
 
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Here you are ;) Is that a Volterra IC2 controller on the second picture. More will come soon ... maybe :cool:
http://i29.tinypic.com/2enti88.jpg
http://img225.imageshack.us/img225/2705/in2.jpg

http://i28.tinypic.com/sy07js.jpg
Very nice pics. =)
By 28cm you mean the whole card, and not just the PCB, that is, including the mounting bracket and DVI connectors sticking outside the case? The PCB alone should be 26.5cm.

And those pics confirmed the construction of the VRM:
● 4 "digital" vGPU phases with Volterra VT1157SF (never seen these before...), option for a 5th vGPU phase
● new type of vGPU inductor package
● 1 "digital" uncore (GDDR5 IMC?) phase with Volterra VT1157SF, option for a 2nd
● 1+1 "digital" GDDR5 vDD+vDDQ phases with Volterra VT242WF
● 2× Volterra VT1165MF controllers (vGPU & uncore)
● the card is SOFTMOD COMPLIANT, YAY!
● 2×6pin, option for 6pin+8pin - not that it matters, though

It's a strong PWM, overall. The PCB supports VT1195SFs aswell instead just the VT1157SFs installed, so there's an open upgrade path for even more stronger parts.
 
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Correct largon!
@theorw Uhhh what ?

 

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I guess both nV & AMD think a high-end card MUST be as long as it is possible.
Makes no sense.
 
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I'm guessing its longer so they can fit a bigger heat sink inside as well.
just measured my case, I literally have just enough space :D

The red vents should touch my HDD cages ha ha

( in a full tower case!)
 
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After measuring up my case i've realised i have nothing to worry about - it can take a full 16 inches before i have to worry :D

Now nothing is in the way of me getting a 5870x2...other than the fact i have no money ofc.