A
Alien
I want to buy a 256mb card, can anybody tell me if there is a
difference in performance between a PCI and AGP 8x card if they have
the same specs?
difference in performance between a PCI and AGP 8x card if they have
the same specs?
Are you refering to PCI or PCI-Express? If you are refering to PCI,Alien said:I want to buy a 256mb card, can anybody tell me if there is a
difference in performance between a PCI and AGP 8x card if they have
the same specs?
Are you refering to PCI or PCI-Express? If you are refering to PCI,
absolutely. The PCI bus is 33mhz, the AGP bus is 66mhz so AGP8X is
533mhz effective. If you are refering to PCI-Express, also yes. The
PCI-E bus is 75mhz so a PCI-E x16 slot can max out at 1350mhz effective.
Keep in mind that PCI-E hasn't been fully utilized yet by games but is
the best option for future proofing.
Am I Batman or Superman? I'm so confused.
The said:PCI-E is 100mhz.
Batman said:I stand corrected.
Am I Batman or Superman? I'm so confused.
Where are you getting these numbers? A PCI Express lane is clocked at 2.5
GHz.
The said:That is throughput, and it is "A single lane is capable of
transmitting 2.5Gbps in each direction, simultaneously."
http://arstechnica.com/articles/paedia/hardware/pcie.ars/5
I'm talking bus speed and my mb's bios tells me it is running at
100mhz, that's how I know.
PCI = 33mhz
AGP = 66mhz
PCI-E = 100mhz
If Ars Technica is claiming that <snip>
If your motherboard is reporting 100 MHz for PCI Express then it's reporting
something other than the lane clocking, probably the clocking of the
parallel bus going into the bridge.
The said:What's this article talking about then?
http://www.nbsgaming.com/PCIEBus.html
The other day while scouring my bios for some random item I found a
rather nostalgic setting that took me back to the good old days when I
used an AGP video card. This setting was the PCI-E bus frequency. In
this little menu you have the option of taking your standard 100 MHz
PCI-E bus and increasing it to upwards of 145 MHz...
What part of "probably the clocking of the parallel bus going into the
bridge" did you have trouble with?
The said:"Probably" isn't conclusive. That's the problem I have with it.
Provide some hard data.
The "hard data" is that PCI Express moves 2 billion bits per second on a
single pair with a 2.5 GHz clock and 8/10B encoding. Every technical
discussion of PCI express by any company that actually makes the chips that
support it explains this.
Whatever is clocked at 100 MHz on the nforce4 chipset is not the PCI Express
lanes unless _you_ can explain how they get 2 billion bits per second on a
single pair with a 100 MHz clock and 8/10B encoding and why Intel and
National Instruments and the rest are wrong and some random overclocker is
right.
Thomas said:You really believe that some chinese workers can come up with some 2,5
Ghz Maiboard, which is gigantic in comparison to the worlds famous cpu
makers, struggling around 3 Ghz on highly integrated chips ?
The "hard data" is that PCI Express moves 2 billion bits per second on a
single pair with a 2.5 GHz clock and 8/10B encoding. Every technical
discussion of PCI express by any company that actually makes the chips that
support it explains this.
Whatever is clocked at 100 MHz on the nforce4 chipset is not the PCI Express
lanes unless _you_ can explain how they get 2 billion bits per second on a
single pair with a 100 MHz clock and 8/10B encoding and why Intel and
National Instruments and the rest are wrong and some random overclocker is
right.
The said:My mb uses a ULI chipset and it says right in the bios - PCI-E clocked
at 100mhz.
Which means that either (a) that clock speed is not the lane clock or (b)
your board is only able to run PCI Express at 5% of the rated speed.
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