Desktops General - Locked Topics
Dell Desktops Community Support Forums all models
Posts
Unsolved
This post is more than 5 years old
5 Posts
0
15708
September 11th, 2008 00:00
9800GX2 in XPS 630
How much slower will the 9800gx2 be in the XPS 630 since in only supports PCI 8x not 16x?
Responses(9)
17
0
1
58
0
1
32
0
5
47
0
3
78
0
3
No Events found!
SR45
12.1K Posts
0
September 11th, 2008 12:00
contrvlr
1.4K Posts
0
September 11th, 2008 12:00
SR45
12.1K Posts
0
September 11th, 2008 17:00
http://www.dellcommunity.com/supportforums/board/message?board.id=Tech_Talk_XPS&message.id=75605&query.id=189468#M75605
Seeing for the first time the 630 16x 8x talk and now I understand the question. Should not be a difference by contrvlr link but wish Dell would get out the proprietary business and all these issues with them
VCraig
2.1K Posts
0
September 11th, 2008 19:00
:smileyvery-happy: :smileyvery-happy: :smileyvery-happy: .... sorry... couldn't help myself..
Architekur
3 Posts
0
September 24th, 2008 17:00
contrvir,
Well I hate to add to the list of disappointed, but her it is... I just ordered a 630 ordered with a 9800gx2, and as soon as I receive it, I will be sending back. I had no idea that you could wire only 8 lanes to a 16x slot, and this type of dual card is a real waste of money on this motherboard (stupid me for not looking into these forums and assuming Dell's xps units are well built). Also the 9800gx2's HybridPower feature is not utilized with the 650 chipset.
Regarding the link to Tom's Hardware review; as far as I can tell the card was tested at 8 lanes using PCI-e 2.0, not 1.1. PCI-e v2.0 is twice the throughput of v1.1 so I assume the results would be more like 4x. These results are not so good.
The question to Dell is how much more money would it have added to the computer if you had used 780i in lieu of the 650i? 50$? $100$ even $200? I think it would have been well worth it to get 2- true x16 PCI-e v2.0 slots. Plus it probably would have solved other light/fan/ESA issues as well.
I have purchased 2-690's, 3-490's for my office, as well as a 410 I'm using right now (with a x16 slot with 16 lanes) and an inspiron 1720 for my wife.
contrvlr
1.4K Posts
0
September 24th, 2008 20:00
Architekur
3 Posts
0
September 24th, 2008 21:00
contrvlr
Sorry if I’m off on my logic. I am only looking at transfer rate for comparison.
The transfer rate for PCIe x8 v1.1 is 0.25 GByts/s x 8 = 2 GByte/s
The transfer rate for PCIe x4 v2.0 is 0.5 GByte/s x 4 = 2 GByte/s
What I was trying to say was the transfer rate, therefore performance of the 630’s PCIe x8 v1.1 would be more like Tom’s Hardware test result for PCIe x4 v2.0 both having the same transfer rate.
I’m new to the issue. Perhaps you could enlighten me on the relative performance between v1.1 and v2.0?
Architekur
3 Posts
0
September 24th, 2008 23:00
contrvir,
Also, my "some strange" logic is shared with the same Tom's Hardware review you referenced
http://www.tomshardware.com/reviews/pci-express-2-0,1915-5.html
"PCIe 2.0 x8
Eight PCI Express 2.0 lanes equal the performance of x16 PCI Express 1.1, providing 4 GB/s upstream and 4 GB/s downstream bandwidth to and from the graphics board."
What am I missing?
contrvlr
1.4K Posts
0
September 25th, 2008 12:00