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  Tom's Hardware UK and Ireland Forums » Motherboards & Memory » Chipsets & Bios » What is the difference between the 780i Sli and the 750i SLi?
 

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

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 Thread : What is the difference between the 780i Sli and the 750i SLi?
 
yetyhunter
Profile: enthusiast
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n°1765388
04-09-2008 at 12:32:57 PM

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.

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nzxtlexa
Profile: enthusiast
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n°1765409
04-09-2008 at 06:54:09 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....


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DD Water Box Plus, QX9650 @ 3.9ghz, eVGA 780i, 4GB Corsair XMS2 DDR2 800(2x2gb), WD Raptor 150gb, 500gb Seagate Barracuda, BFG 8800GTX 620/2000 x 2 SLI, Tagan BZ 1300w PSU, Custom 120.2 Water Cooling
Steven Bancroft
Profile: journeyman
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n°1765410
04-09-2008 at 07:17:03 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.

aevm
Do not eat the styrofoam
Profile: Forum Resident
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n°1765411
04-09-2008 at 07:24:56 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.

Zenthar
Profile: old hand
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n°1765414
04-09-2008 at 07:41:23 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).


---------------
The capacity to learn is a gift; The ability to learn is a skill; The willingness to learn is a choice. - Rebec of Ginaz
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yetyhunter
Profile: enthusiast
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n°1765417
04-09-2008 at 08:41:34 PM

When running SLi the 750i PCie slots are running in 8x?

Zenthar
Profile: old hand
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n°1765427
04-09-2008 at 11:34:07 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.


---------------
The capacity to learn is a gift; The ability to learn is a skill; The willingness to learn is a choice. - Rebec of Ginaz
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Zenthar
Profile: old hand
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n°1765428
04-09-2008 at 11:44:50 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).


---------------
The capacity to learn is a gift; The ability to learn is a skill; The willingness to learn is a choice. - Rebec of Ginaz
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JackNaylorPE
Profile: addict
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n°1765442
04-10-2008 at 01:56:12 AM

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/cpuchipse [...] =3265&p=14

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/showdo [...] i=3279&p=4

frischtr
Profile: stranger
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n°1765481
04-10-2008 at 07:40:26 AM

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

Message quoted 1 times
nzxtlexa
Profile: enthusiast
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n°1765487
04-10-2008 at 09:59:23 AM

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

Message quoted 1 times

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DD Water Box Plus, QX9650 @ 3.9ghz, eVGA 780i, 4GB Corsair XMS2 DDR2 800(2x2gb), WD Raptor 150gb, 500gb Seagate Barracuda, BFG 8800GTX 620/2000 x 2 SLI, Tagan BZ 1300w PSU, Custom 120.2 Water Cooling
resonance451
For great justice!!
Profile: enthusiast
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n°1765492
04-10-2008 at 11:46:11 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.


---------------
Intel qx9650 @3.81GHz (10x multi) + EVGA 780i SLI mobo @381MHz FSB
2x EVGA 8800GT 512mb OC'd, OCZ DDR2 1066MHz 4gb
OCZ 850W PSU, Seagate 750GB HDD SATA 32mb cache CM Stacker 830 SE
Sound setup: FireFace 800, JBL 4328 speakers
JackNaylorPE
Profile: addict
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n°1765517
04-10-2008 at 05:12:03 PM

frischtr wrote :

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.

Message quoted 1 times
JackNaylorPE
Profile: addict
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n°1765518
04-10-2008 at 05:18:19 PM

nzxtlexa wrote :

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.


JackNaylorPE
Profile: addict
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n°1765520
04-10-2008 at 05:19:39 PM