KT400 & KT400A Coming Soon?

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DuckTape

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Jan 16, 2002
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Hello folks.

Anyone know how soon we're likely to see motherboards with chipsets which support (by default) DDR400 RAM? (such as chipsets that might be called KT400 and KT400A?, etc.)

Thanks much,
DuckTape
 
Hey, I hope Soon, Because i really don't want to wait till after June. I want to buy everything by the END of June or Early July....

What else is going to be better on the Kt400,400a Chipset besides supporting the PC2700 DDR400 (by default)

Measure Twice, Cut Once!!
 
Pointless. Even DDR333 support for current Athlons is pointless. Your memory can only transfer data to the CPU at the speed of the CPU bus. The best choice is a 1:1 ratio, in that respect any chipset that will allow you to overclock your CPU FSB to 166 will make full use of DDR333, such is the case with the Iwill XP333 and Leadtek 7350KDA.

What's the frequency, Kenneth?
 
What else is going to be better on the Kt400,400a Chipset besides supporting the PC2700 DDR400 (by default)
Click to expand...
KT400A will have native support for USB 2.0 and faster Northbridge-Southbridge communication (533 MB/sec). Don't know what else.

<b>I have so many cookies I now have a FAT problem!</b>
 
Crashman and all,

<< Pointless. Even DDR333 support for current Athlons is pointless. Your memory can only transfer data to the CPU at the speed of the CPU bus. The best choice is a 1:1 ratio, in that respect any chipset that will allow you to overclock your CPU FSB to 166 will make full use of DDR333, such is the case with the Iwill XP333 and Leadtek 7350KDA. >>

Would KT266 and/or KT266A also be pointless (used with the Athlon XP CPU with matched DDR RAM) in the same respect? What would be the highest-performance chipset that would not be pointless?

Thanks much,
DuckTape
 
No, because in that case the FSB and Memory bus are both 133 (DDR), so there is no bottleneck. He already answered you next question. This is the same reason why RDRAM is needed for peak performance using a P4.
 
What Xynok said. The the XP333 supports 1:1 ratio at 166MHz bus, which is DDR333. So does the 7350KDA. Many KT266/KT266A chipset boards will also allow you to overclock both busses to 166. My preference for the first two boards have to do with my experience with their chipsets.

What's the frequency, Kenneth?
 
Thanks.

Actually, for my second question, I meant to ask: "What would be the highest-performance chipset that would not be pointless for a NON-OVERCLOCKED system?"

Not:
<< What would be the highest-performance chipset that would not be pointless? >>

Thanks again,
DuckTape
 
Thanks again, folks.

I do want to make sure I understand the following...

<< 266a w/ Athlon XP2100 and PC2100(266)>>

Regarding the above non-overclocked system scenario:

To be sure -- PC2100 is the highest DDR RAM to have on such a system without being pointless, correct?

Is there a certain level of the Athlon XP CPU (with Palomino Core) below which would be pointless to have on such a system?

XP1500, XP1600, XP1700, XP1800, XP1900, XP2000, XP2100, etc.

Thanks for your patience and time,
DuckTape
 
I disagree w/ Crashman on this. It's not the speed of the bus but the bandwidth. Intel's FSB @ 100MHz pumps 3.2 GB/s (according to Intel's website) while DDR333(133MHz/PC2700) pumps 2.7 GB/s so the bottle neck is still the memory bus. Also, you have other pipes on that Northbridge feeding the memory bus. You have 4x AGP pumping ~1 GB/s and MuTIOL from the Southbridge pumping 533 MB/s. This is why you see a big performance boost in Tom's Hardware review of SIS645DX of the PC2700 configs compared to the PC2100 configs with all of them using a FSB of 100 MHz. The best ratio is 3:5 (100Mhz FSB/166 MHz memory) and it's not clear from the recent SIS645 motherboard review if all 10 support this ratio.
 
Wonder Boy,

What would you then say to be the highest-performance
motherboard chipset/DDR-RAM scenario (for the Athlon XP CPU, with Palomino Core, 1500-2100) that would not be pointless for a non-overclocked system?

Motherbaord chipset that supports (by default): DDR333, DDR400, or higher?

And to refer to FatBurger's "Cheat Sheet"...

Which DDR-RAM?

PC1600 = DDR200 = 100MHz FSB
PC2100 = DDR266 = 133MHz FSB
PC2400 = DDR300 = 150MHz FSB
PC2700 = DDR333 = 166MHz FSB
PC3200 = DDR400 = 200MHz FSB
Or Higher?

Thanks much,
DuckTape
 
From toms article on the KT333:
Compared to its direct predecessor, the VIA KT266A, our benchmark results show that the VIA KT333 is currently the fastest chipset for AMD Duron, Athlon and XP processors.

Other benchmarks have mathced this. The KT333 with CAS2 RAM is the fastest chipset for AMD at this time. If the price diff is small it is worth it, but only if its not a huge premium. It also allows for future upgrades and OCing =)

Jesus saves, but Mario scores!!!
 
KT400A not only support faster memory. It also support AGP 8X which support more than one AGP slot. I always want a motherboard with 2 AGP slots.
 
What kind of benefits will dual AGP slots on a motherboard have? (How) will this have an impact on people who want to do both 2D/3D Animation and Digital Video Editing on the same computer?

Thanks,
DuckTape
 
I kinda have to agree, dual AGP slots seems like a waste of motherboard real estate.

I was going to get a KT333 board with my new rig. But since it looks like the Tbreds won't be out till mid june..might just be able to get a KT400/a board instead.
 
I would love to have dual AGPs. It sucks even with dual head cards you cant watch a DVD on one screen and play a 3d game on another cuz only one of outputs can use any 3D or DVD functions on the card!

Jesus saves, but Mario scores!!!
 
Yes, it's probably worth 5% more if it offers 1% more performance. But it's not worth it to me if it offers ANY unsolvable or nearly unsolvable problem with ANY of my hardware.

What's the frequency, Kenneth?
 
No, no, no, listen. I put everything in terms of MHz and bus width because so many visters of the forum don't understand bandwidth comparisons (too lazy to do the math). The ONLY correct ratio for standard 64-bit DDR is 1:2 for the P4. That means that when the CPU bus runs at 100MHz, the memory runs at 200MHz, giving you effective QDR400 to DDR400, both with 3200MB/s bandwidth. The INCORECT 3:5 ratio available on ALL 645 boards offers similar performance to RDRAM in most apps because, what it lacks in bandwidth it makes up for in lower latency, performance wise. The ideal 1:2 ratio would put it over the top, people would give up on RDRAM entirely. But the market lacks support for this configuration, both in the memory and chipset areas. And what's worse is that even overclockers DDR400 recently entering the market still would not suffice for overclocking, as an increase to a 133MHz CPU bus would require DDR533 to run at the ideal 1:2 ratio.

So the only good solution for current hardware would require dual channel DDR, where even old PC1600 would, at 128-bits, match the 3200MB/s bandwidth of the standard P4, and PC2100 would support overclocking to the 133 bus, which, BTW, is 4256MB/s, not 4200MB/s as advertised.

What's the frequency, Kenneth?
 
SO I can give credit were it is due...
...Who here has accutly <i>seen</i> a KT333 system working?

And those who have, was there a diference?

I am sick of hearing from people who have only seen other peoples benchmarks...I want to know real performance.

The other thing is this...the price differnce (At least on the Gigabyte GA-7VRX vs. GA-7VTXH+) is <i>nothing</i> so why not go for the new chipset?
You can still use the old RAM in it can you not?

-<font color=green>"<i>Tis not a <b>man</b>, tis a <b>monster</b>!</i>"</font color=green>
 
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