I want to build a cheap dual CPU rig

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EquineHero

EquineHero

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Oct 6, 2015
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I've actually become quite fond of how simple LGA775 computing can be. I am getting my Christmas bonus on January 5th. I know how relatively cheap LGA775 and DDR2 has become. Unfortunately Intel stopped the LGA775 line at 4 cores, but with Xeons I can build an 8 core rig for quite cheap. Can someone help me out with some cheap ATX dual-cpu motherboards? I want to be able to fit this in a standard case. My budget is around $250 (because of other expenses).
Also, can I run LGA775 CPUs in a standard LGA771 socket?
 
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jaslion

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Dec 17, 2012
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Lga 775 cpu's in 771 socket: there was a c2q that is 771 but doesn't support dual cpu
Dual cpu wil be over 250$.
Dual cpu xeon on 771 is beaten by nowadays cheaper cpu's
 
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Nymical

Nymical

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Trust me, those CPUs are cheap for a reason. The performance of a CPU is not merely measured in cores and clock speed, both of which old 771 Xeons have in decent amounts and for only like $50 on ebay. Those processors have an extremely old and outdated architecture built around an old and outdated fabrication process. They may seem, if not on par, but in the same league of today's processors - however, let me assure you they are orders of magnitude less powerful than modern enthusiast PC CPUs, let alone Xeons, to the point that your money would be much better spent fleshing out a full rig with, say, a 6600k or a Kaby Lake processor. In addition, old processors will lose out heavily on features and instruction sets they can support, both in processor and chipset. It will likely come to over $250 because of the cost of a 771 motherboard and accompanying compatible devices. Unless you are die-hard on it, I recommend you forgo the dual-cpu for something more economical. Though, if you must, ebay has probably the cheapest stuff, I have spent a fair amount of time researching the various costs and components of the same class of computer on ebay (the MBs are the hardest).
 
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Nymical

Nymical

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It is impossible to shop by quality or part number for a 775 motherboard at your budget, if you want to keep to the budget you'll likely have to shop by price point and quality of the used part - its what I eventually did (to much autochagrin).
 
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Nymical

Nymical

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Yeah, everything looks deceptively cheap. I trust the CPUs just fine, but the fact of their cheapness and the relative rarity and price of MBs is disturbing - the CPUs are outlasting the MBs and either there is high demand for them or the motherboards themselves are rare at this point.
 
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Matt_150

Matt_150

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Dec 6, 2016
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I am sure it is a combination of both. When I bought my 1366 socket xeons and motherboard it was the same thing, the motherboard was a little over $100 and the cpus were 25 a piece.
 
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Nymical

Nymical

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I ended up cobbling together the cannibalized remains of a few old Dell workstations and ordering the rest of what I needed from eBay, and easily the most expensive thing of all was the PSU. I'll just warn you ahead of time: the PSU is one of the most important factors in the system, because the MBs due to age and the temperamentality of dual-socket chipsets and VRM are extremely voltage-sensitive. Couple that with an old or cheap PSU putting out unclean power and it could overheat, blow a capacitor, or fuse a bridge.
 
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