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What is the difference between the 780i Sli and the 750i SLi?

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April 9, 2008 10:32:57 AM

Because i want to buy a Sli motherboard and I don't know witch one to choose.Curently I own a 8800 GTS 512 and I plan to buy another one .I heard that the 780i has a higher bandwidth than the 750i when running in SLi.
April 9, 2008 4:54:09 PM

Apart from the bandwith (and to be honest when using an Nvidia card, you want the extra bandwith) the 780i is also meant to overclock better, it can take RAM speeds of up to DDR2 1200 instead of the 750i DDR2 800 and the 780i can do triple sli whereas the 750i can't. Think thats about it....
April 9, 2008 5:17:03 PM

nzxtlexa got it pretty much right. When I bought my eVGA 780i I evaluated the 2 boards and decided on the 780i because of the future option of tri-sli (im currently running 2x eVGA 8800T) and better memory (even though im only running 4x DDR2 800mhz 2GB OCZ Sli-Ready). In the future, the board sully supports wolfy and york and is ready to be expanded in 2 years or so.
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a b V Motherboard
April 9, 2008 5:24:56 PM

One more thing to look at. I was comparing eVGA 780i and MSI 750i yesterday. With the eVGA, two double-width cards still leave one PCI slot accessible. With the MSI, all the PCI slots are blocked.
a b V Motherboard
April 9, 2008 5:41:23 PM

EVGA just came-out with a new 750i board which seems to support 2x16x PCI-e 2.0. Anyone has information about it, it might be of interest for the OP if he isn't interested in 3-way SLI (8800 GTS not supporting it anyway).
April 9, 2008 6:41:34 PM

When running SLi the 750i PCie slots are running in 8x?
a b V Motherboard
April 9, 2008 9:34:07 PM

Yes, they are supposed to run both in 8x mode on 750i, that is why most of the 750i have a 16x and a 8x slot, but this one, having 2 16x slots, might be worth investigating.
a b V Motherboard
April 9, 2008 9:44:50 PM

Found this thread on another forum, quite new so you might want to keep an eye on it; they plan to test if the board is truly x16/x16. It seems the board overclocks like hell too (~530MHz FSB I think).
a c 210 V Motherboard
April 9, 2008 11:56:12 PM

790i is current generation....though I haven't actually seen any on sale anywhere, the reviews are month pr 2 old now....so it should be an any day thing....last official release date I heard was February 18 which they obviously missed.

780i is now "old" in computer parlance ... you know ready for the trash pile....geez it gotta be months old !

750i is like er "older" :ange: 

here's some interesting quotes on the 790 vs 780

http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=326...

Quote:
Watch out Intel - NVIDIA's just broken out the big guns and this time they're not holding anything back. Coming out firing with both barrels blazing, the nForce 790i (Ultra) SLI promises to provide users with the ultimate platform for high-intensity, adrenaline-pounding gaming when it comes to combining NVIDIA multi-GPU 3D graphics and the power of today's most advanced Intel desktop microprocessors. Probably sounds a little over the top, but this time we reckon an nForce chipset for the Intel platform will live up to the hype.

Our experience with 790i thus far has been overwhelmingly positive. It's clear to us that NVIDIA's decision to take the extra time needed to fully prepare the board and BIOS for retail release will end up paying dividends in the end. Many of the problems we experienced with early 780i boards are thankfully missing. The effort placed in providing good Auto values for overclocking has also been extremely helpful. Gamers that are looking to buy a system that is capable of practically overclocking itself should seriously consider the nForce 790i.


OTOH, look at some of these comments if you into "extreme overclosking"

http://www.anandtech.com/mb/showdoc.aspx?i=3279&p=4
April 10, 2008 5:40:26 AM

790i boards are available on the egg... Price range from $350-$470, and they require DDR3... Quite expensive at this point...
April 10, 2008 7:59:23 AM

I wouldn't say that the 780i is 'old' now, it is the just the DDR2 brother of the 790i!
April 10, 2008 9:46:11 AM

WTF? 780i hardware is almost identical to 790i, and the 790i requires over-expensive DDR3 which doesn't even give you much of any measurable real-world performance boost.

Oh and who cares if the BIOS updates are done right? BIOS updates don't cost money; with a BIOS update, the 780i's issues are gone.
a c 210 V Motherboard
April 10, 2008 3:12:03 PM

frischtr said:
790i boards are available on the egg... Price range from $350-$470, and they require DDR3... Quite expensive at this point...


Yes, the MSI, XFX and Asus boards hit newegg on April 8th.
a c 210 V Motherboard
April 10, 2008 3:18:19 PM

nzxtlexa said:
I wouldn't say that the 780i is 'old' now, it is the just the DDR2 brother of the 790i!


That was a bit of a dig on the industry in general where anything 6 months old is "ancient".

There are substantial differences between the 780 and 790. Here's some comments from Anandtech

Quote:
Current 780i-based motherboard owners should note with approval the absence of the nForce 200 sub-processor from this line-up as the functionality (PCIe 2.0) formerly provided by this chip is now natively supported by the improved 790i SPP.

One of the major changes over the 780i SLI MCP is the integration of NVIDIA's newly-designed DDR3 memory controller capable of addressing up to 8GB of unregistered, non-ECC DDR3 memory. Add to this the incorporation of complete PCI Express (PCIe) 2.0 bus support and we can see that 790i is more than just a simple upgrade from 780i. Those looking to swap their current board for one featuring the 790i should find more than enough reason to consider the change.

Our experience with 790i thus far has been overwhelmingly positive. It's clear to us that NVIDIA's decision to take the extra time needed to fully prepare the board and BIOS for retail release will end up paying dividends in the end. Many of the problems we experienced with early 780i boards are thankfully missing.

This is first enthusiast level chipset from NVIDIA for the Intel platform that we refuse to refer to as a duck in the labs. You see, just like a duck, the 680i/780i based motherboards seem to wake up in a different world every day. All indications at this point are that NVIDIA finally got their act completely together with the 790i.

a c 210 V Motherboard
April 10, 2008 3:19:39 PM

JackNaylorPE said:
Yes, the MSI, XFX and Asus boards hit newegg on April 8th.


I still haven't see the boards all in a side by side comparison tho. I also wondering what Asus feels is worth the extra $120 other than the HD sound card.
a b V Motherboard
April 10, 2008 3:32:44 PM

Seems the EVGA 750i is truly a 2x16 board (see here, here and here). I think it is a great option for a budget gaming rig, I completely ditched the SLI option a month ago because I felt there were no good middle-range boards (750i was 2x8 and the 780i was way overpriced to my liking for features I didn't even want (3-SLI, dual-lan, ...)). If this board had been around when I purchased my PC, I think I would have been my choice.
April 10, 2008 4:01:41 PM

Yes the 750i FTW is the new evga one and it overclocks like mad plus 2x16pci is correct, for the price its the best gaming boad imo.
April 10, 2008 4:10:42 PM

I just took a look at the ASUS Striker II Extreme LGA 775 NVIDIA nForce 790i Ultra Link
if it supports TRI SLI, and each video card is double wide, which most are...
then were do you put the sound card? that slot would be covered....

Bad planning on Asus part.
a b V Motherboard
April 10, 2008 4:20:06 PM

I think most of the dual-slot cards have the "extra cooling slot" on top so, considering that, you would still have the bottom PCI slot free. Otherwise, you would have to find a PCI-e x1 card to fit in the top-most slot.
April 10, 2008 4:52:16 PM

I missed the extra PCI-e x1 slot at the top. it is black and t didn't stand out...
my Bad...
ok Asus... your not idiots after all... perhaps i am?
a b V Motherboard
April 10, 2008 5:00:58 PM

The real problem IMO is that current MB form-factors weren't designed to accommodate 6 slots of only graphic cards. Even if someone wanted to put additional PCI slots lower, they couldn't as no casing could house them.
April 10, 2008 5:09:30 PM

PCI slots... I can't wait till they stop putting them on boards and just make every slot a PCI-E16.

it would simplify things so much more...
!