Missing CPU caps, any thoughts???

[noone33]

Ok, well a friend of mine has a 4790k getting to hot. Was 88 degrees celsius consistently. He delids and notices caps is missing from the inside (Maybe he poked it off...Personally, looks as if one was never put there...) another is slightly bent. He gave up in frustration and gave it to me. Personally, looking at it, doesn't look to bad IMO. I am thinking I could fix it, I just wanted to ask everyone's opinion first. I was about to test it, but I don't want to put thermal paste on, unless everyone suggests to try and solder a cap back on and to adjust/fix the other. I have soldered caps before, not this small though... It will be a tedious tough job, but I think I can do it . There is no other damage from what I could see. No scratches on the pcb, no other caps are damaged whatsoever, doesn't look like it's been dropped or bumped or anything. So what do you guys think??? Personally for free, testing and seeing and all that noise won't be a problem for me, especially if it still works .

 

[VirtualLarry]

Bad de-lid job.

Anyways, missing caps may make the CPU unstable, especially when overclocked. But I fail to see how they would make it run hotter. Maybe IDC could chime in here.

 

[Burpo]

There are CPU repair service on ebay that will repair it for around $30

 

[noone33]

Yeah, I don't think I would really want to overclock it, even IF it get's repaired. I'll consider the repair service, but I would like to do it myself. I have an i5 gaming pc, so no loss on this IMO. A hot air rework station would be nice. I have an edsyn soldering iron with 5 different tips. Nothing that small sadly... Would hot air be the only way to go???

 

[Idontcare]

Bad de-lid job.

Anyways, missing caps may make the CPU unstable, especially when overclocked. But I fail to see how they would make it run hotter. Maybe IDC could chime in here.

The caps are there to reduce voltage swings, basically to minimize Vdroop.

So he might end up needing to over-volt the CPU just a tad higher when overclocking versus the voltage he would have otherwise needed, but it would be a very small amount.

(and that little bit of extra over-volting would result in just a tiny-bit more power consumption and thus a tiny bit higher operating temperature, but I'd expect it to be less than 1C)

 

[noone33]

So basically nothing to really worry about too much??? Just test it with new thermal paste and see how it goes while keeping an eye on temp and performance???

 

[Abwx]

The caps are there to reduce voltage swings, basically to minimize Vdroop.

Was thinking the same, just that the regulation loop will compensate for the lower discharge time constant by increasing the peak voltages (actualy the duty cycle) , that is, there will be ripples of higher amplitude, that works in the two directions, at stock frequency this shouldnt be a problem in principle.

 

[noone33]

Ok cool, thank you gents for your time. Will post back with how it goes shortly.

 

[noone33]

Sorry for taking so long... was busy, and then had screws that were wrong threads for motherboard... teehee xD... Ok... well i went ahead and tried it with just the thermal paste and ignored the missing caps. And... IT WORKS!!! It is at a consistent 33 degrees celsius operating temp. Under load it is 50 degrees celsius for valley benchmark, heaven benchmark and bioshock infinite. I even decided to be a little bit of a bad boy and do the intel processor diagnostics test on it. Passed it like a boss

.. Unbelievable that a simple thermal paste application to a delided CPU can produce a 50-70 degree drop in temp. All is good now, will post if anything new pops up. I am giving back to my friend a little later. Cool surprise for him xD.

 

[sm625]

..Personally, looks as if one was never put there...

It looks to me like there was one there. When they come off they leave that sort of indentation. If there was never one installed the pad is perfectly smooth, mostly flat but with a slight curve, and taller in the middle.

By the way your post has two image links but one is bad.

 

[noone33]

It looks to me like there was one there. When they come off they leave that sort of indentation. If there was never one installed the pad is perfectly smooth, mostly flat but with a slight curve, and taller in the middle.

By the way your post has two image links but one is bad.

Yeah the other image hosting site didn't want to come up... eh, oh well. You guys still get the jist of it ;P.