Dual PCI-E 8x vs 16x/ Non-Sli?

Hi All first time poster in Toms, long time reader.
I have a question for all the Hardware experts.
Here is my current setup:

Liquid Cooled
Asus A8N-SLI Premium
AMD 4000 @ 2.64
2 gigs Corsair XMS CL2
Dual 7800 GTX (Non-SLI) run for 3 monitors during Flightsim
(these get split 8x 8x)
PC Power 510 @650 Peak
Dell 24 inch widescreen at 1920*1200
Dual Samsung 19' LCD's at 1280*1024
Dual Maxtor in Raid-0 Single Caviar as swap drive...

Now, I have in front of me the A8N32-SLI Deluxe. Basically the same specs, same FSB BUT it would push my dual 7800 GTX, to be replaced with a 7900GTX/7800GTX combination as soon as NewEgg gets them in to a true 16x/16x.
I also have two gigs of the Corsair XMS 3500LL CL2 @433 to put in whichever board I decide to run. Both will support it.

So my question is this. Is it worth the upgrade? Not from a cost perspective but from a performance perspective. Is running both cards at 16X going to be a big difference? Especially considering I run 1920*1200?

I am assuming this would be a complete format of the array which would suck but if it is worth it I am more than willing. I doubt the drivers from one A8N NF4 mobo to another would work. I think the dual x16 boards use different drivers. I run dual boot with two seperate instances for XP one for FS completely modified with no services and one vanilla so I would have to reinstall XP 2x.
Looking forward to the advice.
Thanks in advance,
-Paul Solk
5 answers Last reply
More about dual
  1. From most benchmarks, the difference is usually at most a few FPS higher than dual 8x.
  2. Thanks for the reply,
    Yeah, I have been seeing that and wondering if it is still relevant to me if I do not run SLI. I am basically asking if a single PCIE 16x card is being throttled by running it at 8x or am I still getting enough bandwidth to it. The key is this isn't SLI so it is basically single PCIE 8x vs PCIE-16x. The second card is a mute point...

    Also, any issues running the 3500LL at 1T on the A8N-SLI-Premium mobo?
    Thanks again,
  3. Ugh, I wish I saw that before wasting your time. If it was November of 05 I would not have missed it but November of 04 only way I could have read it was on a plane for work ;)

    Well I know where someone can pick up an A8N32-SLI Deluxe and 2 gigs of Corsair XMS TwinX3200C2 for $200 I can even do another 2 gigs if someone needs... Half price if anyone wants em :) still in the box and then I can get my 700/1800 7900GTX if I can find it anywhere...

    Thanks and apologies,
  4. EDIT: just noticed ur not going to use SLI. Nevermind.

    Uhhh... as far as I know you're not going to be able to run a 7800GTX with 7900GTX in SLi or otherwise. Unless something has changed you need the same model to run SLI. (i.e., 2x7800's or 2x7900's)

    Just an FYI on that.
  5. Is this the same effect that using USB 3 or SATA3 will have on the video card?
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