View Full Version : 975X Vs. 955X ??
Kunaak
06-16-2006, 07:12 PM
I heard a few people claim the 955X OC's better then the 975X boards.
is there any truth to this?
what exactly is different from the 955X boards to the 975X boards?
Stelios
06-17-2006, 06:18 AM
I tested my fatbodies with 955X and 975X . They clocked the same . Maybe 1-2 Mhz difference . I tried up to 2.71V with timmings of 3-2-2 , up to 4-4-4.
I don't know for CPU's ...
Anjelous
06-17-2006, 12:38 PM
Well the 975 if you get the right rev will support conroe, where as the 955 does not, i have the P5WD2-Premium, and its a great board, just wish it had conroe support.
pcoffman
06-17-2006, 12:48 PM
what exactly is different from the 955X boards to the 975X boards?Main difference appears to be support for Crossfire. The 975X can work with SLI, too, but NVIDIA does not support this; i.e. you have to used hacked drivers.
See http://www.intel.com/products/chipsets/975x/index.htm: "support for multiple 2x8 graphics cards".
Anjelous
06-17-2006, 01:11 PM
I know my P5WD2-Premium supports Crossfire.
pcoffman
06-17-2006, 02:12 PM
my P5WD2-Premium supports CrossfireHi,
CrossFire or SLI? The reason I'm asking is that the P5WD2-Premium originally shipped with limited support for SLI but not CrossFire. However, there was also the possibility of additional capabilities with future BIOS updates.
Nevertheless, whatever dual-graphics support is there, it's not part of the 955X chipset. It's s.th. that's been added by ASUS. One of those long PCIe slots is x16, the other an x4 Universal PCIe slot.
P5WD2 Premium supports crossfire
I don't think there is any Intel chipset that officialy supports SLI
lawrywild
06-17-2006, 02:54 PM
P5WD2 Premium supports crossfire
I don't think there is any Intel chipset that officialy supports SLI
They do but the drivers are locked because nVidia don't want intel "ruining" sales of nf4 sli (not that anyone buys them :rolleyes: )
pcoffman
06-17-2006, 03:30 PM
I don't think there is any Intel chipset that officialy supports SLII think you're right. However, there is supposed to be tweaked drivers that will nevertheless work with SLI on a Bad-Axe motherboard.
5-Clicks
06-17-2006, 05:53 PM
Hi,
CrossFire or SLI? The reason I'm asking is that the P5WD2-Premium originally shipped with limited support for SLI but not CrossFire. However, there was also the possibility of additional capabilities with future BIOS updates.
Nevertheless, whatever dual-graphics support is there, it's not part of the 955X chipset. It's s.th. that's been added by ASUS. One of those long PCIe slots is x16, the other an x4 Universal PCIe slot.
The first crossfire setup on XS was on a P5WD2 Premium...955x chipset. the 955x does not officially support dual GPUs, but it'll run them. Heck, why else would it have 2 PCI-E slots and comes with an SLI bridge :rolleyes:
pcoffman
06-17-2006, 07:12 PM
When the P5WD2 Premium first shipped, the SLI did not work too well, and the CrossFire not at all. One reviewer wrote, "Those of you hoping to run an ATI Crossfire or NVIDIA SLI config will want to continue hoping (http://www.viperlair.com/reviews/cpu_mobo/asus/intel/lga775/p5wd2p/)". Other reviewers said more or less the same.
However, there were also promises of better things to come.
There's a distinction between dual graphics capability coming from the chipset and it coming from some other technology on the motherboard. In the case of the 975X, it comes from the chipset. In the case of the P5WD2 Premium, I believe that it's coming from some other technology on the motherboard. Asus makes specific mention of Universal PCI Express technology, which "enables users to plug in an additional PCI Express graphics card (http://www.asus.com/products4.aspx?modelmenu=1&model=493&l1=3&l2=11&l3=184)".
the 955x does not officially support dual GPUs, but it'll run them
Disagree. I do not think that the dual graphics ability comes from the 955X at all.
why else would it have 2 PCI-E slotsTo drive two video cards and four monitors, for one.
Anjelous
06-18-2006, 09:11 PM
Well i know that about 2 bioses ago they added *enabled crossfire support* for the P5WD2-Premium
pcoffman
06-18-2006, 09:34 PM
about 2 bioses ago they added *enabled crossfire support*Thanks!
5-Clicks
06-18-2006, 09:39 PM
Please clarify "other technologies" on the board :) The PCI-E bus goes directly through the chipset, so how else would crossfire be run?
pcoffman
06-18-2006, 11:05 PM
Please clarify "other technologies" on the boardUniversal PCI Express appears to be a technology proprietary to ASUS. I can't find much information on it. Development of the board was done under strict secrecy. CrossFire was made possible through a BIOS update. SLI originally only worked using very early drivers. So maybe CrossFire on the P5WD2 Premium is made possible through a combination of PCIe, firmware, and software. Bottom line. I don't know.
One of those two full length slots is a genuine x16 lane PCIe. The x16 graphics capability of that slot is supported through the 955X chipset. Am uncertain of the relation of PCIe to the chipset, other than that 16x and 1x PCIe are "features" of the chipset.
^don.k's^
06-19-2006, 03:21 AM
P5WD2 does 8x+4x crossfire, that's the problem. Ive had two p5wD2 and one P5WD2-E, both 955's reached more FSB with less vmch, i had to go till 1,9v vmch with the 975x for reach what 955's could with stock vmch.
sora3
06-19-2006, 03:49 AM
Okay, what happens is that the BIOS reads the PCIe config into 16x and 4x for the two 16x PCIe slots for the P5WD2. The drivers does most of the work for Crossfire. I don't there is a difference between the 955x and the 975x except for the higher FSB on the 975x...
Don't they do the same?
~1600MHz as max
sora3
06-19-2006, 04:02 AM
I'm pretty sure that dual core support is one thing that differs from the 975 and 955. But then again, there are cases that dual cores can work with the board...
^don.k's^
06-19-2006, 04:41 AM
P5WD2 do not/will(soon) not support conroe, but 65nm pressler does.
I'd say performance differences are null, just 2,4vdimm in P5WD2-E vs 2,3 on P5WD2. BTW P5WD2 seems to me that have better clockers nb.
Also i975x is 8x+8x CF ready and i955x is 8x+4x CF ready.
Some other differences in storage and layout but none major...
Arnie
06-19-2006, 07:53 AM
i am quite sure i955x is 16x+4x, not 8x+4x
Well the 975 if you get the right rev will support conroe, where as the 955 does not, i have the P5WD2-Premium, and its a great board, just wish it had conroe support.
Don't quote me on that, but it might be possible to RMA your board to Asus to get a new rev supporting Conroe. Depend on how you handle this and the rep you will talk to.
^don.k's^
06-19-2006, 10:33 AM
i am quite sure i955x is 16x+4x, not 8x+4x
Not in CF/SLI mode...
Arnie
06-19-2006, 11:31 AM
are you sure? because it has 20 lanes, but the first 16 cannot be divided, or so i understand. So it would be impossible to make an 8x. Also, it would be stupid, as you would be halving the bandwith of a slot for no reason.
Maybe I am wrong though, if anyone else knows...
^don.k's^
06-19-2006, 11:58 AM
I remember Big Sam doing tests with 6600GT, he showed 8x+4x in the vga config...
pcoffman
06-19-2006, 06:28 PM
I don't there is a difference between the 955x and the 975x except for the higher FSB on the 975x...Supported FSB speeds are the same, for both 955 & 975. 800MHz & 1066MHz.
pcoffman
06-19-2006, 06:58 PM
I'm pretty sure that dual core support is one thing that differs from the 975 and 955The 955 was the first Intel chipset to support dual-core processors. It currently supports both 800 and 900 series. We all know that the Bad-Axe supports Core 2, or at least the latest revisions of the Bad-Axe. Other than that, the lists of officially supported CPUs are pretty much the same. The D975XBX supports the 662 & 672 processors. What is this VT or Execute Disable? The D955XBK also supports some lower end processors.