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| 7/15 |
| 2004/8/24-25 [Computer/HW/CPU] UID:33117 Activity:moderate |
8/24 http://reviews.zdnet.co.uk/0,39023100,39164010,00.htm Intel Prescotts run hotter and slower, comparing complete systems, same graphics card (GeForce 6800GT): Athlon 64 3800+ (2.4GHz) 82W idle 162W max Pentium 4 560 (3.6GHz) 155W idle 258W max \_ Old news. Prescott is a dog. Intel knows this and has terminated all 90nm Pentium 4 products in favor of Pentium M. \_ These are for the latest Athlon 64 and Prescott CPUs, and I am not aware of the above data being readily available. Also, since the first Pentium M-based desktop CPU isn't scheduled to arrive until 2006, it's all Prescott right now for Intel until then. -op \_ It is indeed. Tejas and Jayhawk, the followons to Prescott, were cancelled: http://csua.org/u/8r4 \_ 258W is nuts. Intel can't seriously expect people to build real servers in compact data centers with a nuclear reactor like that. Even without the graphics card, 155W idle (plus a bunch of drives in a server) is insane. Anyone here work for Intel and have any inside dirt on this problem? \_ I don't work for Intel, but I worked for another microprocessor company that shall not be named. It's no secret what's going on, it's the hottest topic in the industry right now. Just google 90nm and leakage power. \_ well what I really was asking is what Intel was thinking when they shipped this beast and if they really thought that Intel Inside(tm) was enough to overcome this horrible heat number. \_ Previous to 90nm, most die shrinks came with a reduction in power consumption. You could just say, "It was too late once they realized they couldn't fix the problem (fast enough?)." Anyway, their yield is increased with 90nm; more chips per wafer; more money. AMD will also be releasing 90nm parts for desktop and mobile; I am curious how they will do. -op \_ having worked there I can assure you that NO ONE there knows the inside scoop. Everyone's so busy and specialized with his own component (cache, chipset, processor, etc) that he/she has absolutely no idea what the big picture is. \_ thanks. \_ I don't work for Intel, but Nocona (codename for next Xeon iteration) will have SpeedStep. Probably they will have SpeedStep for Pentium 4. True, max power doesn't change, but idle will lower and you will stay there longer. -op \_ Pentium 4 is dead. They are going to multi-core and Pentium M based desktops. See the link about about Tejas and Jayhawk. \_ Duh. I realize this. I am talking about what they will have available through 2006. -op \_ If you care about conserving energy, just turn off your desktop machines and monitors when you leave work. A few people turning off their machines and monitors after work saves a lot more energy than getting whatever low-wattage server you can find. \_ I'm concerned about the heat output in my data center. You're not getting a 3.6ghz machine on your desktop in my company. Also, many shops do desktop backups at night so turning off your machine is a no-no. |
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| reviews.zdnet.co.uk/0,39023100,39164010,00.htm Kai Schmerer August 24, 2004 This evaluation of current desktop processors utilises over 60 benchmark tests including office and multimedia software, 3D games, Internet applications, video rendering and compression. We have used benchmarks that are relevant to a range of market sectors in order to get a balanced view of CPU performance. However, in an ideal world, you should also run your own mission-critical applications on any processor that you're considering. Of course, performance is only one aspect of a processor purchase decision. For example, the Athlon 64's support for the NX (No Execute) feature safeguards it from certain virus attacks, and could be reason enough to choose an AMD processor. And if you're after a quiet PC, then AMD's chips have clear advantages over Intel's latest 'Prescott' Pentium 4 The power consumption of the Athlon 64 is lower than that of the Pentium 4 thanks to AMD's use of Silicon-on-Insulator (SOI) technology. The Athlon's 64's 64-bit capability is also a potential advantage, although this feature remains largely unused because of the missing operating system support -- 64-bit Windows XP has now been delayed until 2005. Power consumption System Idle Max Athlon 64 3800+ (Nforce 3) 91W 172W Athlon 64 3800+ (KT800 Pro) 82W 162W Pentium 4 560 (925X) 155W 258W Note: The power consumption figures quoted in the table above refer to a complete system with otherwise identical components. |
| csua.org/u/8r4 -> www.commsdesign.com/design_center/netprocessing/news/showArticle.jhtml?articleID=20000251 has cancelled its single-core processor development efforts, code-named Tejas and Jayhawk, and will move to dual-core designs across the mobile, desktop, and server markets in 2005, Intel said Friday (May 7). The Tejas design, now cancelled, was to have been follow-on to the Pentium 4 Prescott design, now shipping. Jayhawk was intended as a server processor based in part on the Tejas single-core design. "Most of our customers are telling us that dual-core is the right approach," High said. Multi-tasking and multi-threading software "is moving from the office environment into the digital home, and going to a dual-core approach is a way to get multi-threading into the home faster," High said. Pushing the megahertz on a single-core design has increased power consumption markedly. Also, as Intel's pipeline has deepened, the penalty for branch misses has worsened. The shift is an important one: for more than 30 years Intel has deepened its pipeline and pushed megahertz ratings. "For Intel to take its foot off of transistor performance, and move to an all dual core architecture approach, is a big deal," Brookwood said. With the 90-nm single-core Prescott version of the Pentium 4, Intel has run into power consumption problems that stem from design issues more than process technology, Brookwood said. The transistor count on Prescott increased to 120 million, including a megabyte of cache. That is more than double the 55 million transistors on the previous Pentium 4, the Northwood design. The increased transistor account is largely responsible for the high thermal budget, rather than any excessive leakage from the 90-nm transistors, Brookwood said. He noted that Intel's Dothan mobile processor uses the same 90-nm process as Prescott. But the 90-nm Dothan, which Intel will formally announce next week, consumes less power per megahertz than does the 130-nm Banias mobile processor, an indication that Intel's 90-nm process requires less power consumption per transistor, as it should. "Banius, AMD's Opteron, all seem to benefit in terms of watts-per-megahertz from the shift to 90-nm. That tells me that the problem with Prescott is more of a design issue with the large increase in transistor count," Brookwood said. He said Intel has plans to reduce the thermal budget for Prescott to about 93 Watts, from more than 100 Watts now. High, the Intel spokesman, said "the thermal window of Prescott is set, and we have not changed our published plans to move to a 4-Ghz version of Prescott by the end of this year. That said, we will continue to improve the circuits on Prescott." Prototype Circuit Boards from PCBexpress Leading Internet supplier of prototype circuit boards. Easy order process for quick turn pcbs (24-hrs) 2-6 layers up to 25 pieces. C Algorithm to Hardware RTL In Less Than a Day Tensilicas XPRES Compiler automatically generates customized RTL engines from standard ANSI C/C++. Graphically compare different performance/gate-count trade offs in minutes. PMC-Sierra Technology Webinar Series Ethernet over SONET/SDH transport technology: how Ethernet over SONET/SDH delivers enhanced private line and switched data services; |