Cooling passively cool an athlon 3500+ s939

what's the cheapest option to passively cool an athlon64 3500+ in a p180? i can underclock it, but can't undervolt it. my thermalright xp-120 isn't enough, it overheats in about 4hrs of running.

and if i move my xp-120 to replace the stock heatsink on my e4300, what's the best 120mm fan to stick on that?

 

My X2 4200 was passive and now my E2180 OC'd is just aswell. I use a Scythe Ninja rev.2 just make sure theres a case fan near it.

 

i've got a yate loon 120mm @5v right behind it. i could probably up that to 7v. i'd just hate to spend the money on a big cooler and find it won't work. it's just a fileserver.

 

Wonder how the 3500+ heats up so much... I used a Thermaltake Sonic Tower (possibly the best product TT had ever come up with) on my 3000+ and it ran passively just fine. Hard to believe that the difference of 500+ would make more powerful cooler not enough... Maybe XP-120 simply doesn't work passively.

How about a Ninja? After all it's pretty much designed to be used in P180.

 

I doubt that you would be able to run it truly passively without a truly gargantuan heatsink. I've got a HTPC running truly passively, ie with no fans in the box at all, and that gets warm under load despite being a Dothan CPU (using a Ninja mini)

Running it using airflow from a case fan directly behind it is another matter entirely, and shouldn't really be a problem. I've run a 3.4GHz P4E this way with a Ninja, and thats a particularly toasty processor. Just because the fan isn't mounted directly to the heatsink doesn't mean its passive.

A heatsink with a dense fin layout would struggle with indirect airflow, something like a ninja would be just the ticket.

 

I run my parents computer with a 3500+ with a thermal right HR-01 without a fan on the heatsink, just the psu and rear exhaust are enough.