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i840 Not Real Good Solution (Reply to this comment)
by Zeorai
I can't agree with the statements about the Rambus achieving better performance. All the info about it having higher memory bandwith and all is really quite theorectical right now. When Rambus has to use "special" benchmarks to prove when it's memory is faster...some smells rotten. Plus the way the Rambus bus is laid out the more sticks you put in the larger the memory latency will eventually get, the bus works like a series circuit because of the Rambus controller on each bank. I could explain that in more detail, but I think Tom or Anand does a better job. That said, the BX chipset is still the highest performance chipset available, albeit you have to overclock it.
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Sep 13 '00
1:36 am PDT
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Re: just some thoughts (Reply to this comment)
by stevelarrison
The issue with the AGP multiplier is video card stability at high speeds. With 2/3 multiplier, your AGP bus is running at 89 MHz when you run 133MHz FSB. At 140MHz FSB, you are running 92 MHz AGP. Most video cards won't handle much faster than 92MHz AGP. (Spec is 66MHz) However, it is common for cB0 stepping 650 and slower Pentium III's to be capable of running 150MHz FSB. The 2/3 multiplier becomes a hinderance at these speeds.
As far as RAMBUS is concerned, not that I said an i840 motherboard, not an i820. The i840 uses RAMBUS sticks in pairs and increase performance dramatically. The only problem with RAMBUS in the past has been price. That is starting to disappear now.
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Jun 25 '00
4:23 pm PDT
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Re: just some thoughts (Reply to this comment)
by Turin
epinions needs a delete comment option.
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Jun 25 '00
12:08 pm PDT
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just some thoughts (Reply to this comment)
by Turin
128megs of rambus might be less than 400 now, but 256 of pc133 ram will still outpeform one rdram stick, and it will cost only $260.
Also, the lack of the 1/2 agp divider is annoying, but agp4x is overkill right now. An overclocked frontside bus will overclock the agp bus, increasing the agp2x's namdwidth closer to around agp3x if your bx board is running at 133. Thats more bandwidth than any adapter can handle right now anyway. The bottleneck with vidcards is more of a memory latency, the gpu's on the cards just can't get the data fast enough.
Overall, the i815 is a step in the right direction, but a dissapointing one. The BX is still a powerfull chipset, with *new* integrated features (like ata66 controllers, added usb ports, etc depending on what *new* board you get). That's why they are still releasing them. RD boards fail to get much of a performance gain at all, unless you are using duel channel rambus, and who can afford two sticks of rdram? Rdram might be the way to go in the future, but it's not quite the time for it now. I would still stick with bx boards for intel, or get an KT board and a duron if you want to go with amd.
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Jun 25 '00
12:07 pm PDT
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just some thoughts (Reply to this comment)
by Turin
128megs of rambus might be less than 400 now, but 256 of pc133 ram will still outpeform one rdram stick, and it will cost only $260.
Also, the lack of the 1/2 agp divider is annoying, but agp4x is overkill right now. An overclocked frontside bus will overclock the agp bus, increasing the agp2x's namdwidth closer to around agp3x if your bx board is running at 133. Thats more bandwidth than any adapter can handle right now anyway. The bottleneck with vidcards is more of a memory latency, the gpu's on the cards just can't get the data fast enough.
Overall, the i815 is a step in the right direction, but a dissapointing one. The BX is still a powerfull chipset, with *new* integrated features (like ata66 controllers, added usb ports, etc depending on what *new* board you get). That's why they are still releasing them. RD boards fail to get much of a performance gain at all, unless you are using duel channel rambus, and who can afford two sticks of rdram? Rdram might be the way to go in the future, but it's not quite the time for it now. I would still stick with bx boards for intel, or get an KT board and a duron if you want to go with intel.
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Jun 25 '00
12:07 pm PDT
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