Maximum CPU
generated frame rates when limited by Bus Bandwidth |
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PCI |
PCI-X |
AGP |
PCI-Express |
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("normal"
PCI is 32/33 PCI) |
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32/33 PCI |
64/33 PCI |
32/66 PCI |
64/66 PCI |
32/100 PCI-X |
64/100 PCI-X |
32/133 PCI-X |
64/133 PCI-X |
64/266 PCI-X |
64/533 PCI-X |
1xAGP |
2xAGP |
4xAGP |
8xAGP |
x1 PCI-E |
x4 PCI-E |
x8 PCI-E |
x16 PCI-E |
x32 PCI-E |
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bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
bandwidth = |
X |
Y |
133 MB/s |
267 MB/s |
267 MB/s |
533 MB/s |
400 MB/s |
800 MB/s |
533 MB/s |
1067 MB/s |
2,133 MB/s |
4,267 MB/s |
267 MB/s |
533 MB/s |
1,067 MB/s |
2,133 MB/s |
250 MB/s |
1,000 MB/s |
2,000 MB/s |
4,000 MB/s |
8,000 MB/s |
(pixels) |
(pixels) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
(frames/s) |
1600 |
1200 |
17.36 |
34.72 |
34.72 |
69.44 |
52.08 |
104.17 |
69.44 |
138.89 |
277.78 |
555.56 |
34.72 |
69.44 |
138.89 |
277.78 |
32.55 |
130.21 |
260.42 |
520.83 |
1041.67 |
1920 |
1200 |
14.47 |
28.94 |
28.94 |
57.87 |
43.40 |
86.81 |
57.87 |
115.74 |
231.48 |
462.96 |
28.94 |
57.87 |
115.74 |
231.48 |
27.13 |
108.51 |
217.01 |
434.03 |
868.06 |
1920 |
2400 |
7.23 |
14.47 |
14.47 |
28.94 |
21.70 |
43.40 |
28.94 |
57.87 |
115.74 |
231.48 |
14.47 |
28.94 |
57.87 |
115.74 |
13.56 |
54.25 |
108.51 |
217.01 |
434.03 |
2048 |
1536 |
10.60 |
21.19 |
21.19 |
42.39 |
31.79 |
63.58 |
42.39 |
84.77 |
169.54 |
339.08 |
21.19 |
42.39 |
84.77 |
169.54 |
19.87 |
79.47 |
158.95 |
317.89 |
635.78 |
2560 |
1600 |
8.14 |
16.28 |
16.28 |
32.55 |
24.41 |
48.83 |
32.55 |
65.10 |
130.21 |
260.42 |
16.28 |
32.55 |
65.10 |
130.21 |
15.26 |
61.04 |
122.07 |
244.14 |
488.28 |
3840 |
2400 |
3.62 |
7.23 |
7.23 |
14.47 |
10.85 |
21.70 |
14.47 |
28.94 |
57.87 |
115.74 |
7.23 |
14.47 |
28.94 |
57.87 |
6.78 |
27.13 |
54.25 |
108.51 |
217.01 |
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NOTES: |
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1 |
PCI and PCI-X are described here as: (bus
width in bits)/(clock rate in MHz).
So "32/33 PCI" is a 32 bit bus operating at 33MHz (this is
what almost everyone has in their machine, and is what is almost always meant
when someone says "PCI"). |
2 |
PCI-Express can both transmit and receive data
at the same time. The numbers
provided for bandwidth in the table above are the bandwidth available per
direction. Thus x1 PCI-E has a total
bus bandwidth of 500MB/s, 250MB/s in each direction. The CPU |
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generated frame rate is limited by the amount
of data that can be moved from the CPU to the video card. Thus the number shown is the amount of
bandwidth available in one direction. |
3 |
These are theoretical upper limits. No effort is made to show the effects of
other system tasks. Other system
tasks (e.g. reading data from the hard disk) are much more likely to affect
PCI devices than devices that use PCI-X, AGP, or PCI-Express. |
4 |
While specified, 266MHz and 533MHz PCI-X are
not available in the consumer marketplace, nor even mid-range servers. |
5 |
At 133MHz and higher PCI-X is permitted to
have at most 1 slot per bus. |
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