Disadvantage of second PCI-E 16x uses 4x

yovitadiah · 29th Nov 2007, 02:05 PM

From
Intel P35 Express, FSB1333 and DDR3 (page 6: P35 Express – PCI Express) - BeHardware

On paper, the P35 doesn’t appear too much different from the P965 in terms of PCI Express management. The MCH manages 16 lines, which are only attributable to a single peripheral. This is in contrast with the 975x, which can manage 2x8 lines. The second PCI Express x16 port that we find on some motherboards actually uses the ICH’s four PCI Express lines . This of course has a non negligible impact on performances in certain cases.

........

3DMark06, representing a graphic load that is closer to games of the last generation, is affected but to a lesser extent. However, the difference between a x4 and x16 port allow a performance gain from 27 to 29%!

As you can see, it is really unfortunate that Intel didn’t do better than a x4 on a second PCI Express port. The solution used for the i975x, dividing its 16 lines between two peripherals, is more advantageous, because the impact of a single x16 port on gaming performances is low.

So the conclusion you better choose the 965 mainboard with config of 1x PCI-E 16x, and the other is 4x PCI-E 1x....

Any comment and suggest???

PsYkHoTiK · 29th Nov 2007, 02:24 PM

The i975x is old. Current one is x38.

P35 supports 1333FSB where as the P965 does not.

So it really depends on your standpoint. Quite frankly if there is no difference, I would still take the newer chipset (no sense in dishing out for old hardware).

Also the Asus Blitz P35 mobo has 8x 8x crossfire.

Chai · 29th Nov 2007, 05:31 PM

X38 offers 2 independent 16x PCIe, which is the new high end board. P35 was never meant to be a truly high end board, which is why they are crippled in a few ways.

ZuePhok · 29th Nov 2007, 09:39 PM

asus blitz fixes that issue by using an additional controller.

you get 8x, 8x. good enough. if 16x 16x is really that great, manufacturer wouldnt even consider putting 2 GPUs on a single PCB.

seriously, 3Dmark!? what is it? can you play it? i cant seem to find the key mapping page..

Papercut · 1st Dec 2007, 11:01 PM

Quote:

Originally Posted by ZuePhok

seriously, 3Dmark!? what is it? can you play it? i cant seem to find the key mapping page..

Can! 3D Mark Easter Eggs

Max_87 · 2nd Dec 2007, 01:58 PM

LOL 3DMark2001 cow game?

yovitadiah · 13th Dec 2007, 07:58 PM

Actually my problem is...

I'm about building NLE using DFI Inf P965-S, which is its x16 slot use for RADEON 2600 XT and its x4 slot is for AJA Xena LHE Card with Avid Liquid Chrome XE.

But refer to my first post, is it a bandwidth suffer due to "Crossfire" will affect the perfomance of both cards,.... or even this configuration (Crossfire) won't work at all becaue it is not a pair of same GPU?

ZuePhok · 13th Dec 2007, 09:33 PM

no your configuration will not work. first of all, crossfire is an ATI technology. you can only bridge up a pair of Radeon (or 3/4). you can not pair a Radeon with an AJA Xena, or nvidia geforce, or any tomato brand from china, because it just won't work.

What's more, to setup such system, you should worry more about first, your storage I/O and second, the stablity and performance of the driver, than anything else.

Chai · 14th Dec 2007, 08:53 AM

You should be able to use both cards together, but certainly not in Crossfire config.

29th Nov 2007, 02:05 PM	#1 (permalink)
yovitadiah Newbie Join Date: 18 Nov 2007 Posts: 4 Reputation: 0 Rep Power: 0	Disadvantage of second PCI-E 16x uses 4x From Intel P35 Express, FSB1333 and DDR3 (page 6: P35 Express – PCI Express) - BeHardware On paper, the P35 doesn’t appear too much different from the P965 in terms of PCI Express management. The MCH manages 16 lines, which are only attributable to a single peripheral. This is in contrast with the 975x, which can manage 2x8 lines. The second PCI Express x16 port that we find on some motherboards actually uses the ICH’s four PCI Express lines . This of course has a non negligible impact on performances in certain cases. ........ 3DMark06, representing a graphic load that is closer to games of the last generation, is affected but to a lesser extent. However, the difference between a x4 and x16 port allow a performance gain from 27 to 29%! As you can see, it is really unfortunate that Intel didn’t do better than a x4 on a second PCI Express port. The solution used for the i975x, dividing its 16 lines between two peripherals, is more advantageous, because the impact of a single x16 port on gaming performances is low. So the conclusion you better choose the 965 mainboard with config of 1x PCI-E 16x, and the other is 4x PCI-E 1x.... Any comment and suggest???

29th Nov 2007, 02:24 PM	#2 (permalink)
PsYkHoTiK "Little" Devil Join Date: 8 Apr 2004 Location: On the "throne" Posts: 14,661 Reputation: 4442 Rep Power: 64	The i975x is old. Current one is x38. P35 supports 1333FSB where as the P965 does not. So it really depends on your standpoint. Quite frankly if there is no difference, I would still take the newer chipset (no sense in dishing out for old hardware). Also the Asus Blitz P35 mobo has 8x 8x crossfire. __________________ Intel SLAPL 4.3GHz @ 1.35v : 2x2GB OCZ Platinum DDR2 1066 : Asus P5K Premium : WD RE3 250GB x2 RAID 0 : 3ware 9650SE-2LP : G92 8800GTS 512mb 820MHz Core : XFi Platinum : Silverstone OP650 : Silverstone TJ-07 : Dtek FuZion CPU : Swiftech MCW60 : MCP655 : Thermochill PA120.3 w Scythe Ultra Kaze CPU-Z: SLAPL : SLA9U : FX-55 : DDR 600 : VX www.techarp.com PsYkHoTiK's Meanderings

29th Nov 2007, 05:31 PM	#3 (permalink)
Chai Administrator Join Date: 6 Oct 2002 Location: Maranello Posts: 27,884 Reputation: 4630 Rep Power: 81	X38 offers 2 independent 16x PCIe, which is the new high end board. P35 was never meant to be a truly high end board, which is why they are crippled in a few ways. __________________ Chai (Contributor & Forum Admin) http://www.techarp.com/

29th Nov 2007, 09:39 PM	#4 (permalink)
ZuePhok Hold me back! I can't stop posting!!! Join Date: 16 Dec 2002 Location: Floating Island Of Mandango Posts: 8,732 Reputation: 3155 Rep Power: 46	asus blitz fixes that issue by using an additional controller. you get 8x, 8x. good enough. if 16x 16x is really that great, manufacturer wouldnt even consider putting 2 GPUs on a single PCB. seriously, 3Dmark!? what is it? can you play it? i cant seem to find the key mapping page.. __________________ my motto: poison first, think later.

2nd Dec 2007, 01:58 PM	#6 (permalink)
Max_87 h@x! Join Date: 11 Aug 2003 Location: the land of bandwidth cap Posts: 11,430 Reputation: 2090 Rep Power: 38	LOL 3DMark2001 cow game? __________________ Max_87 Tech ARP http://www.techarp.com Dell Studio 15 / P7350 / 3GB DDR2 / Radeon HD 3450 / 250GB 7200RPM / 15" @ 1920x1200 E8600 @ 4.4GHz 1.36v / Asus P5E3 Deluxe / 2x2GB DDR3 / Radeon X1800 / Barracuda 7200.9 120GB / 7200.10 320GB x2 / Caviar SE16 WD5000AAKS / WD6400AAKS x2 / Dell 2007FP x2 / Silverstone ST56F

13th Dec 2007, 07:58 PM	#7 (permalink)
yovitadiah Newbie Join Date: 18 Nov 2007 Posts: 4 Reputation: 0 Rep Power: 0	Need full bandwidth of PCI-e x16 and x4 Actually my problem is... I'm about building NLE using DFI Inf P965-S, which is its x16 slot use for RADEON 2600 XT and its x4 slot is for AJA Xena LHE Card with Avid Liquid Chrome XE. But refer to my first post, is it a bandwidth suffer due to "Crossfire" will affect the perfomance of both cards,.... or even this configuration (Crossfire) won't work at all becaue it is not a pair of same GPU?

13th Dec 2007, 09:33 PM	#8 (permalink)
ZuePhok Hold me back! I can't stop posting!!! Join Date: 16 Dec 2002 Location: Floating Island Of Mandango Posts: 8,732 Reputation: 3155 Rep Power: 46	no your configuration will not work. first of all, crossfire is an ATI technology. you can only bridge up a pair of Radeon (or 3/4). you can not pair a Radeon with an AJA Xena, or nvidia geforce, or any tomato brand from china, because it just won't work. What's more, to setup such system, you should worry more about first, your storage I/O and second, the stablity and performance of the driver, than anything else. __________________ my motto: poison first, think later.

14th Dec 2007, 08:53 AM	#9 (permalink)
Chai Administrator Join Date: 6 Oct 2002 Location: Maranello Posts: 27,884 Reputation: 4630 Rep Power: 81	You should be able to use both cards together, but certainly not in Crossfire config. __________________ Chai (Contributor & Forum Admin) http://www.techarp.com/