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Sabrewings
Mobo-fu Master
Joined: 15 Jan 2004
Posts: 18948
Location: Barksdale AFB, LA
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snap355
Black Belt 5th Degree
Joined: 13 Sep 2004
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Location: 33258
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EmilyB
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 Posted: Thu Feb 24, 2005 10:45 am Post subject: |
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| snap355 wrote: | | Is that a marketing gimmick? |
No its a Doom3 freak-out!!!  |
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Oylpann
Black Belt 3rd Degree
Joined: 10 Nov 2004
Posts: 3844
Location: Oklahoma City, OK
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| Posted: Thu Feb 24, 2005 10:53 am Post subject: |
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| Quote: | | Gainward expects that those cards will end up €200 to €300 more expensive (then the 256mb 6800 Ultra) |
I dont know how much that is in American currency.. but to me it translates to waaaay out of most peoples price range.
| Quote: | | Isn't that a little bit too much for a graphic card unless you are a top model or an actor? |
I think so.
| Quote: | | We know that Robin Williams actually likes to play games but he prefers ATI cards to Nvidia |
until he sees this card 
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EmilyB
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| Posted: Thu Feb 24, 2005 10:55 am Post subject: |
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| Quote: | | If you put those two in SLI this will cost you €1500 - just for two cards. Ouch! That hurts your wallet big time. |
Will the madness ever end!!!
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secretz
Initiate
Joined: 23 Dec 2004
Posts: 25
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| Posted: Thu Feb 24, 2005 11:06 am Post subject: |
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| What a time to win the lottery. |
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Ghen
Black Belt 5th Degree
Joined: 26 May 2004
Posts: 5806
Location: Delaware
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| Posted: Thu Feb 24, 2005 11:38 am Post subject: |
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The 7800 Geforce will still be tons faster in a year or whenever.
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EmilyB
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| Posted: Thu Feb 24, 2005 11:42 am Post subject: |
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| Ghen wrote: | | The 7800 Geforce will still be tons faster in a year or whenever. |
Exactly! And it will mark the end of the Short Live Invention. |
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Sabrewings
Mobo-fu Master
Joined: 15 Jan 2004
Posts: 18948
Location: Barksdale AFB, LA
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| Posted: Thu Feb 24, 2005 11:59 am Post subject: |
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| EmilyB wrote: | | Ghen wrote: | | The 7800 Geforce will still be tons faster in a year or whenever. |
Exactly! And it will mark the end of the Short Live Invention. |
The G70 (7800) is still SLI capable and Nvidia believes that SLI is still going to bring 90%+ increase in performance. It's not so "Short Lived" as you think, Em. Yes, it will eventually bottleneck. But, you underestimate the bandwidth of PCIe.
Everyone says "Oh, well in SLI the cards default to 8x which is AGP speed". No. Incorrect. A mistatement.
8x simply refers to how many lanes (up and down) that the card has access to (not AGP's "8x"; that refers to the number of data points per clock cycle). Please refer to the diagram:
| Quote: | In order to transmit PCIe packets, which are composed of multiple bytes, a one-lane link must break down each packet into a series of bytes, and then transmit the bytes in rapid succession. The device on the receiving end must collect all of the bytes and then reassemble them into a complete packet. This disassembly and reassembly happens must happen rapidly enough to where it's transparent to the next layer up in the stack. This means that it requires some processing power on each end of the link. The upside, though, is that because each lane is only one byte wide, very few pins are needed to transmit the data. You might say that this serial transmission scheme is a way of turning processing power into bandwidth; this is in contrast to the old PCI parallel approach, which turns bus width (and hence pin counts) into bandwidth. It so happens that thanks to Moore's Curves, processing power is cheaper than bus width, hence PCIe's tradeoff makes a lot of sense.
I stated earlier that a link can be composed of "one or more lanes", so let me clarify that now. One of PCIe's nicest features is the ability to aggregate multiple individual lanes together to form a single link. In other words, two lanes could be coupled together to form a single link capable of transmitting two bytes at a time, thus doubling the link bandwidth. Likewise, you could combine four lanes, or eight lanes, and so on.
A link that's composed of a single lane is called an x1 link; a link composed of two lanes is called an x2 link; a link composed of four lanes is called an x4 link, etc. PCIe supports x1, x2, x4, x8, x12, x16, and x32 link widths.
PCIe's bandwidth gains over PCI are considerable. A single lane is capable of transmitting 2.5Gbps in each direction, simultaneously. Add two lanes together to form an x2 link and you've got 5 Gbps, and so on with each link width. |
http://arstechnica.com/articles/paedia/hardware/pcie.ars/5
(please note that this article actually uses the correct "PCIe" naming)
So, an 8x PCIe link has in theory 40Gbps bandwidth. AGP's 8x? 16Gbps.
And that's 8x PCIe. 16x PCIe just blows everything else out of the water in terms of bandwidth. Cards aren't even hitting AGP 8x's bandwidth, much less 8x PCIe. SLI PCIe is going to be around for years to come since that's how long it will take cards to begin to bottleneck on an 8x PCIe bus. Much less the 16x.
There. Said my peace. 
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EmilyB
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| Posted: Thu Feb 24, 2005 12:03 pm Post subject: |
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My beloved Sally is turning into a geek 
Sabrewings thats a really good article, which I am going to take plenty of time over to read, digest and understand, theres a lot of information there, thank you for posting it. |
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