Intel Xeon E5405 Harpertown 2.0GHz 12MB L2 Cache LGA 771 80W Quad-Core Processor BX80574E5405A

Pros: Reasonable price for a decent low end CPU. Running this in a dual CPU server. This was the second install - the first one was running for over a year, 24x7 - no problems.

Cons: Nothing

Pros: The E5405 processors is fast, and runs very cool. I've been running it on my server for several months now, and its been great.

Cons: None. It runs much cooler than I expected.

Other Thoughts: Several other commentors here have suggested that the E5405 is not suitable or not capable of Virtualization. To put it simply, these people don't know what they are doing. I installed this chip onto a motherboard that supports virtualization, I set the proper BIOS settings, and it runs just fine. I have been using it with Hyper-V for months, and never a problem.

If you are using some weird motherboard that supports this chip but not virtualization that's your mistake. More likely however, is that you didn't properly set the BIOS. If you read the manual for your motherboard, it should explain everything.

Pros: Powerful CPU's
Very Efficient IMO -- OS slowed it down somewhat however. :\

My friend also owns a similar server, however, he has more ram than I did. He has had zero problems with it.

I can't think of anything else to say. It's stable. Doesn't crash.

Cons: None really.

I wouldn't recommend enabling VT-x or any virtualization on this CPU. I did have some lag issues on the server where everything would lock up for a few seconds causing my game servers to freeze up and cause my players to eventually give up and leave.. :\

Other Thoughts: I rented a server through ThePlanet currently for $200/mo that has two of these CPU's installed. Specs:

2 x Intel E5405 Quad Core CPU @ 2.0GHz
4GB RAM
250GB Harddrive
Windows Server 2008 Standard Edition (without Hyper-V)

Pros: it works perfect in a Precision T5400 workstation. No complaints!

Cons: none

Other Thoughts: cheap and has great value!

Pros: This is my second review of these processors. Its a good processor but... (See below)

Cons: According to the Egg, these have Vertualization capabilities, however, when I checked them using Intel's processor ID tool, for Win7's "XP mode," I was shocked to see that they are marked as not capable, A huge let down considering I bought two of these when they were $250 each, now to only see that the 2.33GHz xeons do support it and are now the same price as what I paid origionally.

Other Thoughts: Good Processors but misadvertised.

NOTE: this could be due to my aging motherboard, however I'm pretty sure that it is the processor itself.

Pros: This is one very sweet chip. Not a screamer, but nice and cool. My Bios always gives me the CPU temperature as "Low". My system temperature runs at 46C, but a lot of that heat is from the FB Ram.

Cons: Fan noise defaults to loud. Fortunately, my Bios can select a super quiet mode that slows the fan. I don't like any noise, so, I've gone to extra lengths to quiet my computer. It's not completely silent, but I'm very content with the low remaining hum. If you're like me, check out Evercool Ever Green case fans (the green plastic ones). People complain that they don't move a lot of air, but they are very, very quiet. I also use an Antec power supply and it's very quiet.

Other Thoughts: I'm running Ubuntu 64 (Jaunty) and most of the time the CPU's are left with little to do. But I also run Blender, and it's renderer uses all the processors it can find (Or at least all four of mine). It's amusing to watch Blender parcel-out the work to each processor and peg them to 100% utilization. Eventually, one CPU gets stuck with the tough part of the image and we all wait on that! I'd buy and install a second e5405, but I'm not really convinced it would make all that much difference. And I don't want anyone to think Blender is sluggish on this chip. On the contrary, it's crisp and responsive when editing or doing interactive drawing (2048x1152 monitor). It's just that final rendering is always CPU intensive. Pretty pictures cost a lot of computing.

Pros: Processor itself is "decent"

Cons: Wish it was cheaper. With the new i7's out this thing still cost the same as it did when new.

Other Thoughts: IMPORTANT: If you need a passive heatsink for a 1U chassis, this is not the passive heatsink you need. This passive heatsink, while it is passive, is not for passive 1U cooling, only 2U passive cooling and above. So if you understand you need a passive cooling solution... but your passive solution is 1U, this passive cooling is not for you. (Do you understand? Good, don't waste your time buying this passive processor if your passive needs are 1U)

Pros: Runs COOL as a cucumber! 12MB L2 makes this thing a multitasking Wizard. I bought it for an Audio Engineering rig, running two of these, and couldn't be too much happier. With stock heat sink it runs around 29-32c at idle, and peaks at 43c under full load for 12 hours!!! Protools LE 8 runs clean and smooth, doesn't even hit 50% CPU usage even with 36 channels and full automation!

Cons: Heat sink's fan SCREAMS! even at 65% speed, Granted that I have two of them. Would've gone with Passive cooling but didn't wanna risk high operating temps. Multitasks well, but is slow to open apps, probably due to low clock speed.

Other Thoughts: Great processor! I am not using it in a server though that is what it is designed for. It drastically out performs my C2Q that is @ 3.2GHz (stock @ 2.4) even when only running a single processor (not my octacore). I think the GIANT L2 is what gives it its speed. I love this processor and am considering building a single processor Desktop with one of these in it for all my other stuff and for my Fiance to game with.

My Makeshift MacPro (My rig):

SuperMicro X7DAE MB
2- Xeon e5405 @2GHz
8Gb Kingston 667MHz FBDIMM DDR2
Galaxy GeForce 9500GT 1Gb DDR2 (overclocked)
2 WD Green Drives 1TB and 2- 500GB (Raid 0)

all in a Monolith Ext.ATX case.

Running Win7, Mac OSX Leopard (UNPATCHED!!!) and 2 Linux distros: Ubuntu "Jaunty Jakalope" and FEDORA 2007

Pros: Runs really cool (the heatsink without fan is cool to the touch, not even warm). Inexpensive 4 core for your server. Came with a really nice heatsink, but it didn't fit in my 1U server (server came with passive heatsinks anyway).

I want to get another one of them to increase my server to 8-cores

Cons: None.

Other Thoughts: Great processor. No crashes so far.

Pros: Runs cool, low power too.

Cons: Almost didn't fit in my Norco 1104 case because of the heatsink size. About a sliver too big. Still fit it in removing a screw in the case.

Other Thoughts: Cheap for the power.