Summary: 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.
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.
Summary: 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: 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.. :\
Summary: 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 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 t...
Summary: 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).
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 G...
Summary: i run Folding@Home bigadv units on these processors. they recommend 2.6 GHZ dual quad core processors for these units, but the 12 MB cache makes up for what they lack in speed. very pleased. would purchase again if i had to.
Pros: been running dual E5405's at 100% load for 6 months. runs cool and has given me zero complaints. really love it. the 12 MB cache adds greatly to its performance.
Summary: 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...
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.
Summary: 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.
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 ...
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.
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