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PCI-E Expansion slot

by ahoyfromtroy / February 15, 2007 11:52 AM PST

What exactly is the purpose of the little 1" slot next to the PCI Express slot, i know that its a part of the PCI-E slot but that is its purpose? I cant seem to find anything on a video card that would plug into the slot. Not even the big monster video cards that take up two expansion slots.

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by Darton Fury / February 15, 2007 3:46 PM PST
In reply to: PCI-E Expansion slot

a CNR, but why not consult your MoBo book for a definitive answer?

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It's 1x pci-e.
by ahtoi / February 15, 2007 4:27 PM PST
In reply to: PCI-E Expansion slot

I really don't think people would use that. To me..it seem like it defeat the whole purpose of pci-e.

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PCI Express [PCIe] slots
by Ray Harinec / February 16, 2007 12:05 AM PST
In reply to: PCI-E Expansion slot

come in 1X, 4X, *X, 16X [mainly the video]. 8X seems to be mainly for servers. The PCIe 1X is actually faster than the basic PCI. The slots can be addressed indepently. [each X is a dual lane bidirectional bus].

Have not really seen much in the way of cards for PCIe 1X, although if I remember correctly there is a Matrox 1X video card.

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by ramarc / February 16, 2007 12:17 AM PST

there's also a radeon x1300 that fits in the 1x slot. some sli and crossfire motherboards have dual 8x slots for the graphics card.

pci-express is not limited to just graphics cards. it supports anything including hard drive controllers and network interfaces. eventually pci slots will fade away just as isa slots.

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When I got the info about pci-e 1x is faster than the pci,
by ahtoi / February 16, 2007 5:50 PM PST

I went shopping for a SATA controller (1x) but didn't have much luck.

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use that slot for all its worth.
by thomasxstewart / February 16, 2007 2:22 AM PST
In reply to: PCI-E Expansion slot

One thing is that 16X can be 16X or 8X or 4X or 1X depending on how you adjust bios. Because PCI-e was invented by Intel & then dropped from Intels developement, those redundand specialty slots, 1X, 4X never had much developement, pci has 1X & 4X capabilities in most machines.

Worse, 16X slot(s) often turned out to be only 8X, due to improper engineering. Today you can get 16X slot(s), yet then you need game card with 16 or 32 or 48 lanes to fill space. Thats todays top & its not Vista friendly, designed at time prior to Vista. So new level of game cards is coming 16X/32X. with twice bandwidth of todays top game card(s). Unfortuneately 4 16X slots will not take four 48 lane game cards & do any more than one 48 lane game card, theres just not enough bandwidth to support anymore than 48 lanes at present. So new slot or slot with greater bandwidth or more slots or just get ripped off by advertiseing. By summer mess will be in full swing.

This is why 1X slot goes relatively unsupoorted, theres just not time to figure out such short lived & difficult design. When same result can be reached with pci 1x/4x slot that already is mature.

For instance how to double 16X slot bandwidth without affecting 1X slot bandwidth, probably not possible. Then ther'd be next generation of one X too, too confusing for average consumer. So PCI-e 2.0, or 16x/32x like 2x/4x pci (agp) years ago or no solution, which leaves all 3d '6 scores with no improvement & then games exact same size even though game card is twice as fast, well room to profit is from others confusion & thats where its all leading. Its best to fill all slots, 1X using firewire card may be best idea, as its HOT & makes your system smoother & hotter, even if it remains unused, once installed.


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your assessment is a bit off
by ramarc / February 16, 2007 5:20 AM PST

first, pci-express is backwards compatible with pci, not physically, but programatically. if someone makes a pci card, its a cinch for them to make a 1x pci-express version. 1x's are rare because there are still far more pc's with pci slots than pc's with 1x pci-express slots.

as for throughput, about the only current card that can swamp a x8 slot is a geforce 8800gtx and even then only in certain games. benchmarks have shown that sli systems with 2 x8 slots show little performance loss compared to 2 x16 slots and any loss is attributable to the north/southbridge implementation. http://www.pcper.com/article.php?aid=212&type=expert

each pci-express lane can handle 2.5Gbps bi-directional traffic. x4 has a theoretical bandwidth of 2GB/sec (unencoded useable data) which is the equivalent of AGP 8X and double the bandwidth of 64-bit/133mhz pci-x. x16 is serious bandwidth and even x4 is overkill for most add-in cards (network, raid, firewire-800, etc.)

the pci-express 2.0 spec was released in jan '07 and it is completely backward compatible with 1.0. pci-express will be the bus standard for pc architecture for at least the next 5 years.

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