SLI Mode Comparison Question

Shadow6107 · 05-10-06, 04:09 PM

Alright, I'm getting ready to build a new PC this summer, but being a (poor) AGP user, I know very little about PCI-E. I do know that in the world of SLI motherboards, some will run 16x with a single card, and 8x/8x with two cards, then I saw the ASUS A8N32 Deluxe SLI, which will run 16x/16x SLI, I see these numbers, but specifically what do they mean in terms of performance?

PWatterson · 05-10-06, 04:12 PM

Actually, the 16x bandwidth for both cards has virtually no performance increase. 8/8 is plenty.

Shadow6107 · 05-10-06, 06:30 PM

Well, I appreciate the help on that aspect of the question, but the other half of the question is, what exactly does that effect? what, specifically, is the difference between 16x/16x and 8x/8x?

PWatterson · 05-10-06, 08:27 PM

Quote:

Originally Posted by Shadow6107

Well, I appreciate the help on that aspect of the question, but the other half of the question is, what exactly does that effect? what, specifically, is the difference between 16x/16x and 8x/8x?

I am no expert, but I believe it determines the amount of data that can be transferred at once. It is something like the bus width or something, but like I said I am no expert when it comes to stuff like this.

azu · 05-10-06, 08:32 PM

8x refers to the bandwith of the PCIE bus. theoretically 16x>8x. but as you know, we are unable to ever take full advantage of the entire bus. From early results, the 16x actually showed lower performance value as it has two nforce4s which needed to work together.

This is similar to agp 1x, 2x, 4x,8x, pci mode

lol. just clearifying.

in terms of performance 8x8x or 16x16 there is little negligable performance difference.

Neuromancer · 05-10-06, 08:36 PM

Actually the 16/16 board is not a good investment right now because nvidia didnt ADD 16 lanes to get the 16/16. they took it from other places.

The radeon 3200 I believe is true 16/16 and the next nvidia chipset will include it also.

I could be TOTALLY wrong though

05-10-06, 04:09 PM	Thread Starter #1
Shadow6107 Registered Join Date: Apr 2006 Location: Georgia	SLI Mode Comparison Question Alright, I'm getting ready to build a new PC this summer, but being a (poor) AGP user, I know very little about PCI-E. I do know that in the world of SLI motherboards, some will run 16x with a single card, and 8x/8x with two cards, then I saw the ASUS A8N32 Deluxe SLI, which will run 16x/16x SLI, I see these numbers, but specifically what do they mean in terms of performance?
	QUOTE Thanks

05-10-06, 04:12 PM	#2
PWatterson Member Join Date: Sep 2005 Location: Annapolis, MD	Actually, the 16x bandwidth for both cards has virtually no performance increase. 8/8 is plenty. __________________ Personal: Intel E3110 - Biostar TPower I45 - 2x2Gb Mushkin Redline - eVGA GTX260 Core 216 - WD VelociRaptor 74Gb RAID 0 - Seasonic S12II Bronze 520w - Antec Twelve Hundred Spare: AMD Opteron 165 (2601 MHz @ 1.325v x 110%) - DFI nF4 Lanparty SLI-DR - 2x1Gb OCZ Platinum - eVGA 7800gt SLI - WD 120Gb - Enermax 350w Gov't Issued Desktop: Intel E8400 - Dell Motherboard- 4Gb DDR2 - ATI Radeon HD4670 512 Mb - 320Gb Seagate Gov't Issued Netbook: Intel Atom Z520 - 1GB DDR2 - 40Gb PATA
	QUOTE Thanks

05-10-06, 06:30 PM	Thread Starter #3
Shadow6107 Registered Join Date: Apr 2006 Location: Georgia	Well, I appreciate the help on that aspect of the question, but the other half of the question is, what exactly does that effect? what, specifically, is the difference between 16x/16x and 8x/8x?
	QUOTE Thanks

05-10-06, 08:32 PM	#5
azu Member Join Date: Dec 2005	8x refers to the bandwith of the PCIE bus. theoretically 16x>8x. but as you know, we are unable to ever take full advantage of the entire bus. From early results, the 16x actually showed lower performance value as it has two nforce4s which needed to work together. This is similar to agp 1x, 2x, 4x,8x, pci mode lol. just clearifying. in terms of performance 8x8x or 16x16 there is little negligable performance difference.
	QUOTE Thanks

05-10-06, 08:36 PM	#6
Neuromancer Member Join Date: Oct 2005 Location: Tau'ri	Actually the 16/16 board is not a good investment right now because nvidia didnt ADD 16 lanes to get the 16/16. they took it from other places. The radeon 3200 I believe is true 16/16 and the next nvidia chipset will include it also. I could be TOTALLY wrong though
	QUOTE Thanks

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