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To SLi??

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November 18, 2011 10:54:38 PM

Hello, ive been reading that newegg posts false memory amounts on SLi cards, for instance a "3072 mb" card is really only 1500 mb because they are accounting for dual GUIs. (1.5GB x 2 to reach the said 3000 mb. ) is there any truth to that? i would like to shoot for 3000 mb memory, should i SLi? any recommendations for good cards + mobo?, preferably EVGA cards and ASUS mobo. im using a intel core i7- 2700K CPU. 1155 socket type

http://usa.asus.com/Motherboards/Intel_Socket_1155/Maxi... i like this mobo, one question though, this has 4 PCI express 2.0 x16 ports, but the board only supports 3 way SLi. what else can go in the extra slot? (noob question, i know;) )

is an SLi supported PSU required? recommended?

thank you in advance! :D 

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a b U Graphics card
November 18, 2011 11:19:00 PM

It's not a false amount, it has that much memory and it will say so on the box. If you want 3GB VRAM then your only option is to get a special edition 580 with that much. Your PSU doesn't have to "support" SLI officially, but it it should match the ratings of one that is.
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a c 143 U Graphics card
a b } Memory
November 18, 2011 11:40:28 PM

Quote:
Hello, ive been reading that newegg posts false memory amounts on SLi cards, for instance a "3072 mb" card is really only 1500 mb because they are accounting for dual GUIs. (1.5GB x 2 to reach the said 3000 mb. ) is there any truth to that? i would like to shoot for 3000 mb memory, should i SLi?

Dual GPUs in one PCB such as the GTX 590 or HD 6990 are in fact dual GPU (Graphics Processing Units) with 1.5 or 2 GB (depends on the model) of VRAM working in SLI/CF mode but they say GTX 590 3GB or HD 6990 4GB (for marketing) but it does actually have 3GB/4GB but only 1.5/2 GB of This truly used between the GPUs because the VRAM is mirrored not doubled between the GPUs.
Some GPUs are not strong enough to benefit from extra VRAM, for ex: there's no difference between GT 210 1 GB and GT 210 2 GB because the dedicated GPU is not strong enough to handle all the textures and packs thrown on it.
And newegg is not selling false cards. If you want a 3 GB GPU get the GTX 580 3 GB version.
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one question though, this has 4 PCI express 2.0 x16 ports, but the board only supports 3 way SLi. what else can go in the extra slot? (noob question, i know;) )

The Mobo has 4 PCIE 2.0 X16 routed at (x16/x16/x8/x4) the 3-way SLI to work probably would benefit from (x16/x16/x8) the x4 would bottleneck that performance that's why they stated it;s "3-way" capable. The additional PCIE slot can be used for a fast ethernet adapter,modem or anything has PCIE 2.0 interface.
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is an SLi supported PSU required? recommended? thank you in advance!

Yes for sure, it must be certified for SLi/Cf fro the proper connectors, you can have a 800W PSU but only have 2 x 6pin PCIE connectors which is not applicable for 3-way CF/SLI setups.
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a c 230 U Graphics card
a b } Memory
November 18, 2011 11:42:01 PM

As far as the newegg fake stuff goes, they are literally correct, there is actually 3072 MB or physical memory on the board. The full 3072 is never available to each and every frame as 1536 is asugned to ha;f the load and the other 1536 is assigned tot he other half .... they are never using all 3072 to 'work the same set of pixels.

http://forums.nvidia.com/index.php?s=59f24dec65ae4a020b...

"SLI cards" as you have designated them or "dual GPU cards" are not a good purchase decision IMO. Exhorbitantly expensive for no appreciable gain.

Guru3D uses the following games in their test suite, COD-MW, Bad Company 2, Dirt 2, Far Cry 2, Metro 2033, Dawn of Discovery, Crysis Warhead. Total fps (summing fps in each game @ 1920 x 1200) for the various options in parenthesis (single card / SL or CF) are tabulated below along with their cost in dollars per frame single card - CF or SLI:

$ 215.00 560 Ti - 900 Mhz (495/862) $ 0.43 - $ 0.50
$ 340.00 570 (524/873) $ 0.65 - $ 0.78
$ 480.00 580 (616/953) $ 0.78 - $ 1.01
$ 725.00 6990 (762/903) $ 0.95 - $ 1.61
$ 750.00 590 (881/982) $ 0.85 - $ 1.53

From the above we see that one 590 gets 881 fps for $750 ..... but twin 560 Ti's get 862 fps for $430 ... that 19 extra fps cost ya $320. Adding a 2nd 590 gives ya a whopping 10%.

As for the MoBo ... and what slots can be used for what .... here's a good review

http://www.tweaktown.com/reviews/4233/asus_maximus_iv_e...

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is an SLi supported PSU required? recommended?


yes and no .... I mean it don't have to say "SLI supported" or anything, but you will want both the wattage and necessary number of PCI-E connectors.

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a b U Graphics card
November 19, 2011 12:11:15 AM

you do not need an SLI ready PSU, but it is recommended for the average user since it is more likely to work properly without having to do a ton of research.

In fact, a SLI ready PSU may be too small under the right circumstances since a SLI ready PSU uses a "typical" setup and SLI cards. If you have a lot of HDDs or other devices then you might be overdrawing the PSU recommended to SLI a specific set of cards.

You do need the correct wattage, and you need most of the PCIe connectors. You can get adapters, but you don't want to overdo it with them unless you know how to make sure you aren't overdrawing one of the individual cables.
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November 21, 2011 8:55:00 PM

hmm, ok thanks.

so far its looking to be a pretty wattage hungry machine, would dual 560 Ti's draw much more then a single 590?

how much effect does memory interface have on the display? most 560 Ti's are 256-bit, where 580's are 384-bit.

what is the difference here?
HDCP Ready SLI Support Video Card
HDCP Ready SLI Support FPB Video Card

both cards are identical except for the FPB is clocked slightly slower, same price. i will go out on a limb and guess that this is for SLI, where one is the "main card", and the other is support?

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a c 546 U Graphics card
a b } Memory
November 21, 2011 11:55:13 PM

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so far its looking to be a pretty wattage hungry machine, would dual 560 Ti's draw much more then a single 590?
Under a typical gaming GPU load two GeForce GTX 560 Ti graphics cards will draw 294 Watts (24.5 Amps) from the +12V rails. The GeForce GTX 590 would be drawing 356 Watts (29.67 Amps) from the +12V rails. I'm talking about graphics card power consumption only not system power consumption.

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how much effect does memory interface have on the display? most 560 Ti's are 256-bit, where 580's are 384-bit.
If the Memory Interface Width is too narrow the memory bandwidth will be too low for the GPU to operate at its maximum performance because it will be starved of data. The Memory Interface Width needs to be properly matched with the power of the GPU. Providing a Memory Interface Width that is wider than what the GPU needs is a waste of money since the extra width will be under utilized.

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what is the difference here?
HDCP Ready SLI Support Video Card
HDCP Ready SLI Support FPB Video Card
FPB (Free Performance Boost) looks like EVGA's marketing term for factory overclocked GPU. On the EVGA GeForce GTX 560 Ti FPB the GPU is overclocked to 850 MHz whereas a reference clocked GeForce GTX 560 Ti card's GPU is clocked at 822 MHz.
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November 22, 2011 9:17:12 PM

alright, i see. is it possible to mix and match cards, say SLI'ing 560 Ti, with a 570, with a 590? (random combo, proof of concept)
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a c 143 U Graphics card
a b } Memory
November 22, 2011 9:23:32 PM

You can't SLI different models even if from the same series. A 560 with a 560, 570 with a 570, 580 with a 580. Can't SLI 580 with 570.
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a c 546 U Graphics card
a b } Memory
November 22, 2011 9:24:22 PM

6_5x47lapua said:
alright, i see. is it possible to mix and match cards, say SLI'ing 560 Ti, with a 570, with a 590? (random combo, proof of concept)

No you can't SLI across different GPUs. You can only SLI cards with identical GPUs and memory bus (i.e. Memory Interface Width).
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November 23, 2011 1:32:35 PM

is it worth eliminating cards from the potential-list, because of their ports? like, will HDMI always carry better clarity over DVI? except for having to go through an adapter in most cases, i dont think Mini HDMI is worst then standard HDMI. is there like a rated list? i.e. hdmi best, display port second, dvi worst?
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a c 271 U Graphics card
November 23, 2011 1:57:24 PM

6_5x47lapua said:
is it worth eliminating cards from the potential-list, because of their ports? like, will HDMI always carry better clarity over DVI? except for having to go through an adapter in most cases, i dont think Mini HDMI is worst then standard HDMI. is there like a rated list? i.e. hdmi best, display port second, dvi worst?

DVI and HDMI will have the same picture quality but HDMI also carries audio by default, DVI does not.
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November 23, 2011 1:58:07 PM

never mind, disregard my last, got her all figured out. thanks all!
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a b U Graphics card
November 23, 2011 2:31:20 PM

HDMI, DVI, and display port are all digital signals, so they will always be the same quality assuming the manufacturers use equal quality parts for the interfaces.

HDMI has two "advantages" over DVI (I'm not familiar with display port). It can transmit audio, and it has HDCP which is needed for 1080p blu-ray playback.

In terms of usefulness for a computer I think it goes DVI, HDMI, then display port. I say this because almost every monitor/TV has DVI. HDMI is on all TVs, but not all monitors. Display port is rarely present on any devices and I can't say I've ever seen a monitor/TV that has display port inputs.
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November 23, 2011 2:52:20 PM

thank you. i also found that display port has almost 6 gb/s transfer rate over the latest and greatest (V1.4) HDMI.

hdmi is still nothing to sneeze at, and i will probably go with it so i can hook up my ps3 or other devices, like you said a device with display port is rare.

the two monitors i narrowed it down too did not have both ports, one was hdmi and dvi, the other display port and dvi.
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January 24, 2012 8:43:12 PM

Best answer selected by 6_5x47lapua.
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a c 271 U Graphics card
January 24, 2012 8:52:54 PM

This topic has been closed by Mousemonkey
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