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Well, I've got an i7 980X and am seriously thinking of going AMD Piledriver FX-8 Eight Core 8350.
Why ?
Well, my assassin G1 motherboard is fantastic but old tech, marvell sata3 sucks for SSD, no more new BIOS for it, old PCIe , Tri channel DDR.
Upgrade for 980X not a chance now, or complete new system.
AMD have kept the AM3 boards for future chips which is excellent.
Is anyone here using an 8350 or similar for Folding and what results does it give? This is a good test of multi-threaded performance as F@H scales well with increased cores/threads.
It's not as good as one might expect, looking at that. The closest I've got the results for is 8055 but, assuming it's similar to the 8056, I got exactly the same PPD from a 2600k at 4.4GHz. As hyperthreading only gives a 30% boost over 'real' cores this far more than negates the 10% clock speed difference and the I7 performance per core seems much better than the 8350, even on the previous generation. I'll run up F@H client 7 when the current WU ends on my test PC and see how a 3570 (no K) compares.
The batch is 1244PGN.
The chip seems to be able to handle some serious under voltage so I did some extended testing.
At the default base frequency (4.0GHz) the chip is Prime95 stable with just 1.1875V
Crosshair V Formula-Z (LLC matched to leakage = Ultra High, OCP 100%, Phase Control = Standard, VRM Fsw 300kHz, VRM DC = T.Probe, VRM Response = Regular)
VRM input current = clamp on a EPS12V
VRM input voltage = Fluke DMM
VRM output current = CHIL DCR
VRM output voltage = Fluke DMM & CHIL Vsen
Workload: Pov-Ray 3.7 RC6 (all core benchmark).
The VRM efficiency peaks at 77.2% on Crosshair V Formula-Z, which is decent but not the best.
The VRM on CVF-Z is built to withstand some severe molesting. It can take anything you can throw at it, however this will hurt the efficiency a bit.
Lowering the core voltage from 1.3250V to 1.1875V decreased the power consumption by 42.8% (VRM Input) or 39.9% (VRM Output).
Now it fits into the 95W TDP envelope too
Since Prime95 is no considered as "normal use" (for CPU power measurement) I made separate tests with it.
Settings: Custom 512K - 512K (LargeFFT, In Place)
Core VDD: 1.3250V
VRM Input Current: 14.98A
VRM Input Voltage: 12.13V
VRM Input Power: 181.70W
VRM Output Current: 103A
VRM Output Current: 1.316V
VRM Output Power: 135.54W
Core VDD: 1.1875V
VRM Input Current: 10.52A
VRM Input Voltage: 12.13V
VRM Input Power: 127.60W
VRM Output Current: 77A
VRM Output Current: 1.184V
VRM Output Power: 91.16W
No, cost isn't the issue. I'm just comparing performance for equivalent hardware. As you said, the 8350 should do well because it has 8 discrete cores but it isn't any better than an old i7 with only four discrete cores and hyperthreading, only running 10% faster. If we say that the base i7 at the same speed as the 8350 has half the performance, add 30% for hyperthreading then the 10% clock difference we get a 'performance index' of 0.715. This says to me that Intel's multi-thread handling is still much better than AMD's. From this, I would expect a 3770K to easily match a 3530 at the same speed and use much less power doing it.You got the same score from a 2600K @ 4.4Ghz?
Then it does much better than i thought if you have to overclock what is a £230 2600K by 30% to match a £150 FX-8350 at stock.
If your just looking for raw performance (regardless of cost) then this is your best bet http://www.overclockers.co.uk/showproduct.php?prodid=CP-440-IN&groupid=701&catid=6&subcat=1672
No, cost isn't the issue. I'm just comparing performance for equivalent hardware. As you said, the 8350 should do well because it has 8 discrete cores but it isn't any better than an old i7 with only four discrete cores and hyperthreading, only running 10% faster. If we say that the base i7 at the same speed as the 8350 has half the performance, add 30% for hyperthreading then the 10% clock difference we get a 'performance index' of 0.715. This says to me that Intel's multi-thread handling is still much better than AMD's. From this, I would expect a 3770K to easily match a 3530 at the same speed and use much less power doing it.
Dont spend too much money, as fx 8350 seem cheap to get on and run 8 core never mind how fast,etc... just save money also intel will release new haswell that will be 1150 as sb or ib owners cant upgrade to new haswell as sb/ib using 1155 that will fork out a lots for haswell cpu and mobo as am3+ still can get steamroller in 2014 that would be nice cheaper cost plus some cash in your pocket.. i own 8350 that seem great run on my asus cfv, i wouldnae spend too much money... just grab cheaper one. It up to you to decide for yerself..
Stock versus stock it competes against the locked i5, but the FX8350 isn't locked, and even when it does go up against the 3570k, both clocked, it can come up both ahead and behind situation depending, that's why you can't give a random blanket statement and quote "IT'S X SPEED FASTER" etc.
I'm no Intel/AMD fanboy, but anyone giving ridiculous blanket statements on either side should just stop (Along with the prophecy's, and the palm reading)
That's all well and good but socket 1155 is almost 2 years old now, people have had tremendous CPU performance for almost 2 years, and it won't have cost them anymore/much more than your CHV and FX8350 has cost you (Arguably some people who have been on AMD in that time may have spent more as they've went to AM3+ and then got a Zambezi and then Piledriver, obviously not everyone has done that, likewise people have also gone SB and IB), except they'd had the performance for a rather long time while AMD was still on Phenom II, then Bulldozer, and finally Piledriver, the fact Haswell is coming out and changing socket shouldn't be a negative on Intels side, it's progression and arguably they're doing it in their weaker area which is their IGP, while they're still increasing their cpu performance, socket 1155 stuff won't cease to exist entirely straight away.
The fact is, Intel has a mainstream and Enthusiast platform both with overall X and Y performance, and then you've got AMD's overall in the Y for certain situations, there's plenty of CPU's to fit into certain budgets and certain workloads. I just wish the fanboys would quieten down and people would stop making ridiculous statements based on nothing.