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Looking for drop-in replacement to Sempron 140 AM3 - Page 2

post #11 of 20
" Note: Multiple processors and 64-bit processing won't render models faster; however, SketchUp can successfully run in emulation mode on 64-bit versions of both Windows and Mac OS X. " -Sketchup Knowledge Center.

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post #12 of 20
Thread Starter 
No need to make apology. Your feedback has been quite helpful. I can put off acquiring multiple cores until I actually find some use for them. Interestingly enough, FreeCAD - something I've been looking at as a Sketchup replacement - is also single-threaded.

edit: Your insights regarding Sketchup slowdowns due to instability seem to have hit paydirt. Here's the situation:

I have two models I completed recently, one of which has a bunch of cylinders - several thousand, in fact - while the other has a bunch of cylindrical cavities. Both file sizes are identical, and both caused major slowdown in Sketchup during any kind of move or resize operation. It took hours to resize both models at 3.7 ghz (the NB was also heavily overclocked, and the RAM timings were very tight). Resource monitor showed 100% CPU utilization throughout the entire operation with practically no disk activity or memory hard faults (and RAM usage of 52% or lower - typically around 30-37%).

I recently noticed instability doing other things (running Fallout 3, incidentally), so I redid the entire overclock without any voltage tweaks. Prime95/LinX/MemTest86+ got me to 3471 mhz @ stock voltage. Fallout 3 was having fewer problems, but it still locked up a bit, so I backed it off to around 3423 mhz with commensurate decreases in NB and RAM speed (just lowered the HTT). All seemed well.

So, I decided to repeat a resize operation I had done previously @ 3.7 ghz to see how long it would take. Resizing the second model took less than an hour - probably 45-50 minutes. I attempted another resize to repeat the results, and it crashed. Ooops! Not so stable after all.

Next I reset the system to stock settings across the board and attempted to resize the first model. Blowing the model up to 10x its normal size took LESS THAN A MINUTE. Shrinking it to .1x its size (returning it to normal) also took less than a minute. So, I went to the second model, and well, it's still going after about an hour, so I have to assume that a). my chip is no longer 100% stable at stock or b). resize operations are going to choke on this model more than on the first one.

I may have to start using Sketchup for stability testing!
Edited by drmrlordx - 4/7/14 at 9:20am
post #13 of 20
No Apology required. I'm glad we sorted that out before hand. Imagine how frustrating that would have been buying a nice new shiny umpteen-core CPU only to find out that performance doesn't scale proportionally with core-count headscratch.gif


I don't know how well the sketchup render engine scales with CPU cache size and performance, but the Sempron only has a 1MB L2 cache. If the engine scales well with more faster cache, then an upgrade could be more significant than just whatever nuances of architecture and clock speeds are in play. It still may be worth looking at higher performing dual cores as freeing up a "dedicated" core for the render engine thread combined with having much better cache performance could cause a larger jump in performance than expected. If you find a used phenom II C3 (2-4 core) for cheap it would probably be worthwhile.
     
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post #14 of 20
You may be able to push a dual / quad core Phenom up pretty high. They sure have decent single threaded performance thumb.gif should be able to hit high clocks on it.

Otherwise I'd probably agree with mdocod regarding the Pentium (3MB for the Pentium G3430).


May be worth keeping an eye out for a used I3. If they are cheaper than the Phenoms that'll be a better bet.
post #15 of 20
Or even as mdocod suggested earlier, a better GPU to offload work on open cl calculations.
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post #16 of 20
openGL

Minor but important distinction.

The 8800GTX should be fine though.
     
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post #17 of 20
Quote:
Originally Posted by mdocod View Post

openGL

Minor but important distinction.

The 8800GTX should be fine though.

I stand educated thumb.gif
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post #18 of 20
Thread Starter 
I am definitely looking at the late-gen Regor chips with 2 mb L2. Ebay has some 280s for $60 shipped, which is ehh. They have some lower-end chips that might have unlockable L3 (CADAC) for $25. At least now I have some more realistic targets, so I may proceed accordingly. As far as Sketchup scaling with cache goes, your guess is as good as mine. Right now I'm still having trouble identifying which parts of my slowdowns under Sketchup are related to model complexity and which parts are related to instability. Model 1 can now be manipulated very quickly, but Model 2 is still sluggish. It may well be that the old Sempron is now volt-stressed and prone to failure at any speed, which begs for an upgrade in and of itself.

Jumping to a new platform is probably not going to happen right now, but yeah, an i3 would be a logical choice. An old Clarkdale might even be fun . . . sort of.
post #19 of 20
The model that is performing weirdly may be corrupted (by the prior instability).
     
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post #20 of 20
Thread Starter 
True. I may have to redo it entirely @ stock and retest. It may also be something to do with the way Sketchup handles internal, rather than external, geometry.
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