good or bad idea: 5.5K euro for machine 2xTitanZ

[Godstrike]

"Of course if you go the 900 series route your power requirements will reduce as the cards are less hungry - 165W for the GTX 980. "

Godstrike, on paper & for games only..for CUDA aps this cards draws almost the same as 780s =)

as for 750..it wasn't working at all, before Guys haven't done some tweaks on code, & this new card has some things inside that differ from 750..so, I guess we need to wait =) new release is coming soon, maybe support (revised performance issues) for new cards will be there =)

Glimpse, where did you see this, or do you have one and have done your own tests? Crikey, if it draws the same power under CUDA and the performance is still crap, well then 'Houston, we have a problem!':)

Wrt. the 750ti, I did not know that. I saw the cards released and people started reporting great Octane performance, missed the whole card not working and requiring new Octane code thang:)

[smicha]

Guys,

I'll be short and precise (got so busy, about 20kg delivery is knocking at my door - stay tuned here http://render.otoy.com/forum/viewtopic.php?f=9&t=42540)

1. 980 draws 280W under full load for GPGPU tasks.
http://www.tomshardware.com/reviews/nvi ... 41-13.html

2. 780 6GB will be available at my local wholesaler within one week, expected price is about 500$. These asus strix dissipate heat inside chassis so putting 4 of them on air leads to high temps and fan noise.

3. 2x titans Z gives comparable to 4x780 6gb performance. 4x780 for 1/3 of price of 2x titans Z. Save you money and get yourself well ventilated chassis, high end PSU or even go with water-cooling which gives more than 40% increase in performance.

Need to go. A big box arrived...

[Godstrike]

Guys,

I'll be short and precise (got so busy, about 20kg delivery is knocking at my door - stay tuned here http://render.otoy.com/forum/viewtopic.php?f=9&t=42540)

1. 980 draws 280W under full load for GPGPU tasks.
http://www.tomshardware.com/reviews/nvi ... 41-13.html

2. 780 6GB will be available at my local wholesaler within one week, expected price is about 500$. These asus strix dissipate heat inside chassis so putting 4 of them on air leads to high temps and fan noise.

3. 2x titans Z gives comparable to 4x780 6gb performance. 4x780 for 1/3 of price of 2x titans Z. Save you money and get yourself well ventilated chassis, high end PSU or even go with water-cooling which gives more than 40% increase in performance.

Need to go. A big box arrived...

How does it draw 280W when powered by only 2 x 6 pin power connectors I wonder? The way I understand it one receives 75W from the PCI bus, and 75W each from the 6 pins. Maximum wattage available to the card is 225W.

[glimpse]

some 980s (like wind force from gigabyte) have dual 8pin, just to keep card from running out of juice under load & not to cap possible performance..& for those that have less..dual 6 power might become an issue under extreme loads (& don't even dream about OCs =)..

[Godstrike]

Guys,

I'll be short and precise (got so busy, about 20kg delivery is knocking at my door - stay tuned here http://render.otoy.com/forum/viewtopic.php?f=9&t=42540)

1. 980 draws 280W under full load for GPGPU tasks.
http://www.tomshardware.com/reviews/nvi ... 41-13.html

2. 780 6GB will be available at my local wholesaler within one week, expected price is about 500$. These asus strix dissipate heat inside chassis so putting 4 of them on air leads to high temps and fan noise.

3. 2x titans Z gives comparable to 4x780 6gb performance. 4x780 for 1/3 of price of 2x titans Z. Save you money and get yourself well ventilated chassis, high end PSU or even go with water-cooling which gives more than 40% increase in performance.

Need to go. A big box arrived...

There is also a GTX 980 4GB Reference card only drawing 177W on that same GPGPU graph, I'll take one if it proves to be snappy after Octane tweaks. It seems the power consumption on these cards do spike on the overclock, so running them stock may be the way forward.

[Godstrike]

some 980s (like wind force from gigabyte) have dual 8pin, just to keep card from running out of juice under load & not to cap possible performance..& for those that have less..dual 6 power might become an issue under extreme loads (& don't even dream about OCs =)..

Yeah, most likely. The OC versions must have more juice coming in, but that 177W reference model would be fine for me if it's fast!

[glimpse]

Yeah, I guess, every card has it's own use case & user to fit =) 980 are not so bad as some might think from some talks around here..

to understand the thing.. nVidia came with gk104 in 680, after gf110 in 580..the same was done again.. with gm204 in 980 over gk110 in 780 - that's in itself that's an achievement.. - they progress steadily =)

it's just for some, who don't mind messing around a bit with water cooling or case mods 780 (6gb) still offers a lot of performance with headroom & that brings good value =) if all the performance nvida promises could be squeezed out of 980 it will prove to be a worthy card for GPU rendering =)

[Godstrike]

Yeah, I guess, every card has it's own use case & user to fit =) 980 are not so bad as some might think from some talks around here..

to understand the thing.. nVidia came with gk104 in 680, after gf110 in 580..the same was done again.. with gm204 in 980 over gk110 in 780 - that's in itself that's an achievement.. - they progress steadily =)

it's just for some, who don't mind messing around a bit with water cooling or case mods 780 (6gb) still offers a lot of performance with headroom & that brings good value =) if all the performance nvida promises could be squeezed out of 980 it will prove to be a worthy card for GPU rendering =)

Indeed, we'll just have to wait and see:) Looking at those compute scores on Tom's I am more optimistic now! Would love to swap my 2 x GTX 590's for 2 GTX 980's to run with my GTX 780 ti's. Now that system would move!

[rappet]

Thanx guys for all your thoughts...

in short my question is:
"If I stick two extra cards next to 2xTitanZ, will it work in Octane with simple basic mahiwe configuration, whatever other software/OS/.. settings are need to work with 6GPU (counting TitanZ as 2x GPU)?"

Long story:
At this moment I am thinking of an new AC system with 2x TitanZ
and I want to be able to fill the empty slots (immediately or later) with 2x Titan Black (I already have in an other PC) or 780's.
This way I will have one machine with big power and 6 GPU 6gB.
(Whenever a new card is much faster then Titan or 780Ti I wil swap my 4x580 3gB in my current machine...
this way I will have two machines with almost maximum power filling the 8 slots and always a backup machine if something goes wrong with one of them).

Now.. the potential problem is this... the PC seller says that he can only deliver PC with two TitanZ,
and not with 2xTitanZ + extra cards.
The reason he says is that it will not work with more GPU's added without having to do software tricks (which the shops is not allowed to do).. the TitanZ are in fact double GPU, he says, and therefor 4 GPU to start with and the extra cards will not work.
OK.. I assume he is right about max of 4xGPU concerning gaming or other software that needs to have special settings somehow somewhere to make it work.
But how is this with Octane?
If I stick two extra cards next to the 2xTitanZ, wil it work in Octane whatever other software/OS/.. settings?

The other option I still have in mind is a new machine with 4x 780Ti.
(Ok then I will have 3gb, but Is till have two Titan Blacs in other machine if I need to render 6gb scenes, but uptillnow most ofmy scenes I can handle with 3gB).

greetz, Jeroen

[glimpse]

hi, Jeroen,

mm, I think he (seller) refered to games..as in Octane render forums there's plenty of rigs running multiple dual GPU cards (590,690..-TitanZ is no exceptional card as far as I know) - anyway, as a buyer, You can always get the rig back (I believe, so You shouldn't be worried too much if something is not working =) unless..policy of the shop don't allow that..

P.S. Are You aware that TitanZ is tripple slot card? I don't see how You're going to fit two more cards in the same case =DDD that (physical limitation) might not work =)

unless You have two single slot cards, or mod Titans with watercooling to dual slot.. or maybe using ribon cables..

the last question is what motherboard are they going to use?=)