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Intel Roadmap Update June 1999 - Part 3, Desktop Chipset and Mobile CPU Roadmap

Tom's Summary of Computex99 Part 1 - Platform News

Preview of VIA's upcoming Apollo Pro+ 133 Chipset

Rambus on Alternate Platforms

Performance Impact of Rambus

Performance Impact of Low Latency DRAM

DRAM Performance: Latency vs. Bandwidth

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Preview of Intel
Краткое содержание статьи: There's still 2 1/2 months to go until Intel will launch the new i820-chipset, also known as 'Camino'. However, the early days in the life of Camino are long over

Preview of Intel's Upcoming 'Camino'-Chipset

Редакция THG,  22 июня 1999


There's still 2 1/2 months to go until Intel will launch the new i820-chipset, also known as 'Camino'. However, the early days in the life of Camino are long over. People who closely followed Intel's roadmap in the last 9 months know that Intel pushed the release of Camino from June 99 back to September 5, 1999, because the price of the RAM used in combination with this chipset (RDRAM) was not coming down as quickly as expected. Thus it shouldn't be a surprise that Intel has already finished the 'B0'-stepping of i820, which normally is the first release silicon.

RDRAM, the Controversy-Memory

We've already heard tons about the 'Camino-controversy', which mainly goes on about Camino's focus on a new memory type, known as 'direct Rambus RAM' or RDRAM. This RAM has the advantage of a very high peak bandwidth, but the disadvantage of a high latency at the same time. We also know that Intel does not believe that the next type of SDRAM, known as PC133 SDRAM, is going to be a feasible thing, resulting in a lack of support of this new SDRAM-type in all future Intel products.


Camino adds some other nice features, one of the less impressive ones is the support of the new ATA66-EIDE standard that's already realized in Intel's integrated i810-solution. The most anticipated new feature is Camino's introduction of AGP4x. This new AGP-standard can transport double the amount of data to the current AGP-standard, which makes most sense in combination with a high bandwidth system memory, but we still shouldn't expect too much of it. So far it's difficult to see any difference between AGP1x and AGP2x products, let alone the lack of AGP-support in the well-performing 3D-graphics solutions from 3Dfx.


First of all, an i820-platform should provide a better performance than the well-known BX-chipset, since this is the chipset that Camino is supposed to replace. Memory performance does not have that much of an impact on overall system performance as one might think, most software doesn't even make much of a difference between SDRAM running at 66 MHz versus PC100 SDRAM, but there should still be some improvement in performance of Camino over BX, since Camino's 400 MHz PC400 RDRAM has exactly twice the bandwidth of PC100 SDRAM. However, let's not forget that the CPU can only take advantage of 33% more memory bandwidth, and this only in case if the CPU runs at 133 MHz FSB. The other thing that should improve more or less significantly is the graphics performance, but as we know it already from AGP2x, only very few gaming applications do really take advantage of the AGP-bandwidth.

Testing was Tough

I had the pleasure to fight with a Camino-board that was equipped with the B0-stepping of i820. The motherboard came with three RIMM slots, it was not equipped with the new 'MTH' and any DIMM Slots for PC100 SDRAM.

RIMM-Slots don't look much different to DIMM-Slots, but you have to fill each empty slot with a terminator to avoid any reflections at the high speed Rambus-interface. I was unfortunately not lucky enough to get more than 64 MB PC800 RDRAM, so that I had to test the systems with less RAM than I usually use. You can imagine that more RAM would have been better to show the performance differences of the different platforms, but 64 MB should still be enough for a first evaluation.


There's one interesting note that may not be known to the majority of you. There are now three different RDRAM-versions, PC600, PC700 and PC800 RDRAM, according to a Rambus-interface clock of 300, 356 and 400 MHz, and I wanted to test PC600 against PC800. The PC800-RDRAM I have would of course run at 300 MHz as well, but this seems to be possible at 100 MHz FSB only. It seems as if at 133 MHz FSB you're only able to run RDRAM at 400 MHz, at 100 MHz FSB you can choose between 300 and 400 MHz. This was definitely the case for the board I've tested, but it could be that later revisions can run PC600-RDRAM at 133 MHz FSB as well. It's also possible that the RDRAM speed has to be a product of the FSB. In case of a FSB of 133 MHz this would mean that only 400 = 133*3 MHz is possible, but at 100 MHz FSB there's 300=100*3 and 400=100*4. It's not very likely that Intel will keep the RDRAM-speed tight to the FSB though, because this would make PC700 completely impossible.

I was also not quite lucky with the AGP4x. The Savage4-driver crashed before reaching the Windows98-desktop and TNT2 would produce general protection faults as soon as I started a 3D-application. Thus I could only test with office applications or some special software. 3D games were unfortunately out of the question. I will supply you with AGP4x-results as soon as I'll get a platform that does it properly.

I also came across an odd problem with Pentium III's L2-cache. As soon as I clocked my PIII higher than 550 MHz, the L2-cache wasn't recognised by the motherboard anymore. This made it very easy to run the special benchmarks in which I wanted the L2-cache to be disabled, but it did not give me the chance to do a normal benchmark comparison between Camino and BX at 600 MHz. Instead of this I compared 533/133 results to 550/100 results, which I consider as pretty sensible. 533 MHz is not much less than 550 MHz at all.

Test Setup

As BX-platform I used the following:

  • Intel Pentium III 550 processor w/o multiplier lock
  • Abit BX6 Rev.2 BX-motherboard
  • 64 MB PC100 SDRAM from Micron, which ran at a latency setting of '2' even under 133 MHz FSB
  • Hercules Dynamyte TNT2 AGP graphics card, NVIDIA reference driver 0188
  • Western Digital WDAC 418000 EIDE HDD w/ATA66-support

The equipment of the Camino-board was identical except of the 64 MB PC800 RDRAM RIMM.

The tests were ran under Windows 98, built 4.10.1998 at 1024x768x16 bit screen resolution. The refresh rate was 85 Hz. The benchmark software used was BAPCo Sysmark98 and Intel's Application Launcher Benchmark. I preferred BAPCo over Winstone, because it reports the results more accurately and it's a lot easier to do several runs. It takes a good amount longer than Winstone though.

Please be aware of the fact that Camino is not optimized for the highest performance yet. This goes mainly in regard to L2-cache performance and other architectural things. However, it's not likely to expect much more memory performance than what we see right now.

Results - Pentium III 533 and 550 with L2-cache enabled - Part I

First I tried comparing Camino with BX by running Camino with a PIII at 533/133 MHz vs. BX with a PIII at 550/100 MHz and 533/133 MHz. In those cases the system ran normally, the L2-cache of the processor was enabled.

It seems as if the information I got from the motherboard-makers is completely correct. With normal software such as the Sysmark98-business applications, Camino is just about as fast as BX at 100 MHz, even a tad slower. Not even Naturally Speaking 3.52 is benefiting too much from Camino's fast RDRAM and Photoshop is again faster on BX than on Camino. It is obvious that BX overclocked to 133 MHz FSB is smoking Camino significantly.

Results - Pentium III 533 and 550 with L2-cache enabled - Part II

Having a closer look at the Sysmark98-results shows quite well, which application doesn't benefit from Camino's RDRAM and which does. Corel Draw 8 doesn't seem to like RDRAM much at all, but Powerpoint can take a bit of advantage of Camino.

Results - Pentium III 600 with L2-cache disabled

Disabling the L2-cache gives Pentium III of course a performance hit. However, it makes the system performance much more dependent on main memory performance. This is what we want, to find out about the benefits of Camino and RDRAM.

Camino is looking a lot better now against BX at 100 MHz FSB. BAPCo Sysmark98 does not make that much of a difference, but Natural Speaking 3.52 and Photoshop can take a clear advantage of Camino's higher memory bandwidth once the CPU runs without L2-cache. Comparing the results can also show you where the motherboard maker needs to improve its Camino-platform. The L2-cache doesn't seem to improve the performance of this Camino-board as much as it improves the performance of the BX-platform. Again, BX at 133 MHz FSB is way ahead of Camino. This shows that memory performance DOES make a difference, particularly with missing L2-cache.

Latest Memory Pricing

Now since we know that Camino and the new RDRAM can't really show earth-shattering improvements over our beloved BX-platform, unless AGP4x should unexpectedly be a big performance booster, it's time to look at the costs. How much penalty do we pay for the little performance improvement of RDRAM?

Right now the price for RDRAM is rather scary. It's not quite clear if the RDRAM-price is for PC600, PC700 or PC800 RDRAM, but the source is a major memory-provider and thus reliable. RDRAM goes for about six times the price of PC133 or ten times the price of PC100. I wonder if the little performance improvement of Camino is indeed worth that amount of money. I can understand very well now why Intel delayed the Camino-launch.


It seems pretty obvious that Camino plus RDRAM is a very questionable solution right now. The performance increase over today's top of the line systems seems marginal, however the costs are exorbitant. Running Camino at 100 MHz FSB is even less sensible, because the CPU still corresponds with the system at the same speed as with BX. We users can demand more performance and a lot lower prices. This will have to happen until September 5, 1999, unless Intel wants to experience their very own Waterloo with Camino or 'i820'.

Looking at the benchmark results makes one thing perfectly clear. Right now the right solution would be a slightly modified BX-chipset that can divide the FSB by 2 so that the AGP can run at the desired 66 MHz whilst the FSB runs at 133. BX with PC133-support would be faster than any other x86-chipset that I've seen so far and it would be so easy to make this chipset reality. This won't happen though. Therefore we'll either need to wait until VIA or ALi supply us with a well performing solution of a PC133-platform, in case that'll ever happen, or we go ahead and shell out a significant amount of money for a Camino-platform plus RDRAM, without receiving a decent performance increase in return. It might be best sticking to BX altogether.

Please read more about Camino and RDRAM in Intel Roadmap Update June 1999 - Part 3, Desktop Chipset and Mobile CPU Roadmap and Tom's Summary of Computex99 Part 1 - Platform News, or more about VIA's PC133-platform in First Test of a PC133-Platform.

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