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"Overclocking A Dual Athlon-- Twice The Fun!"
Ryland Page - 7/5/02
I've always wanted a dual CPU system to play with.
Until fairly recently, they've been reserved for servers and high-end workstations and equipped with an high-end price tag.
Recently, thanks to AMD, this has changed. AMD's 760MPX chipset is the newest and affordable chipset supporting dual socket A processors in a SMP (Symmetrical Multi-Processing) configuration.
Motherboards utilizing this chipset have become semi-plentiful, with six choices currently on the market. They are for the most part relatively inexpensive. A Tyan S2466 refurbished can be had for less than $200 US online. Some other motherboards are a bit more, but hardly ever more than $300 US.
To save more even more money, you have the option to use cheaper CPUs in the board.
The only Athlon that officially supports SMP is the Athlon MP. However, it has been discovered that Athlon XPs will function properly in a dual-CPU setup as long as the L5 bridge on the processor is closed.
Older XPs come with the L5 uncut. Newer models have it laser cut and require it to be closed in order to work in a dual setup. This process is similar to unlocking the XP's multiplier, but is easier because the pit of the laser incision doesn't need to be filled.
People have many questions about this. For a good, succinct answer, see this thread in the overclockers forums.
The new, Morgan-cored Durons may also be used in SMP.
This all puts the price of a dual-Athlons well below that of a competing Intel Xeon system, and that's all I have to say about the competition…
I started to shop.
Motherboard
I read some reviews, and based on Firing Squad's 760MPX motherboard roundup, I decided on the Gigabyte GA-7DPXDW due to its score.
Processors
I decided to pay a bit extra and got Athlon MP processors.
The differences between XPs and MPs are small:
# MPs are 'SMP Certified' by AMD and are guaranteed to work in pairs.
# MPs have the L5 bridges closed (duh!)
# MPs have their multipliers unlocked. Yes, their L1s aren't cut.
These differences between an XP2000+ and an MP 2000+ cost me $50US per processor. Whether or not it's worth it is up to you. For me, I was new to Athlon SMP and didn't want to take the chance of getting an XP that wouldn't run in SMP or wrongly closing an L5 bridge.
Memory
The Gigabyte board, like some 760MPX boards, requires registered DDR to work. This is for stability, which becomes more critical in SMP when you have DRAM feeding more than one CPU at a time. The recommended amount of memory is usually about 512mb per CPU so I went with 1024mb of Crucial PC2100 registered DDR in two 512mb sticks.
Cooling
This is a tricky issue. The 760MPX boards don't necessarily follow the normal mechanical standard for socket A heatsinks. They don't observe the same exclusion zones and some don't have the 4-bolt holes around the socket, either.
The Gigabyte has these holes, but I didn't want to risk getting a pair of Alpha 8045s and have them not fit. I opted for the best, small HSF I could find: the Millenium Glaciator II.
Storage
One of this machine's purposes was to be a file server. I wanted some redundancy and some speed so I wanted to run a level 5 RAID hard drive system. The Gigabyte, like a lot of newer motherboards, can come with an onboard Promise 2-channel ATA133 RAID controller. This can't handle RAID 5, so that was out.
I looked at U160 SCSI RAID controllers and drives, but found them too expensive. I decided I wanted an ATA RAID 5 capable controller and chose 3Ware Escalade 7410. This card uses a 64-bit PCI slot, has 4xATA100 channels, and is RAID 5 capable.
For drives I used a quartet of Western Digital WD30000 30GB ATA100 7200rpm drives. This would yield me 90GB of storage after one drive was used for array parity. For information on RAID types go here.
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Si piensas montar un maquinón asi te recomiendo que mires la pagina
http://www.araceli.info
que trata sobre la refrigeracion.
Salu2