Broadwell i3-5005U 2.0Ghz 15W CPU - AVX2.0 sustained load?

[VirtualLarry]

I was looking at getting an MSI Cubi. They come in Celeron (3205U), Pentium (3805U), i3-5005U, and a new unreleased i5 model as well.

The i3 and i5 support AVX2.0. The i5 supports Turbo (base 2.2, turbo 2.7).

My question is, does Broadwell apply the +0.100V to the CPU Cores, when running an AVX2.0 load? And would a 15W U-series i3 CPU be able to run a sustained AVX2.0 load, or would it throttle, or possibly even shut down?

If throttling is likely, then it would probably be pointless to get the i3 model, and it would be better to stick to the Celeron.

 

[Enigmoid]

Are you going to be running continuous AVX 2.0 loads?

If you run the igp as well yes the unit will certainly throttle.

I think the question is more "Will the CPU throttle during tasks I will place on it?"

 

[2is]

If throttling is likely, then it would probably be pointless to get the i3 model, and it would be better to stick to the Celeron.

I would hope that buy now you'd have learned from your past mistakes of getting underpowered components only to complain about them and replace them a couple weeks later. What is it you plan on doing that will cause the i3 to throttle and be only as fast as a Celeron?

Do yourself a favor and get the i3 and put this tired routine of buying crap and replacing it with crap behind you. It's time to move on.

 

[VirtualLarry]

Are you going to be running continuous AVX 2.0 loads?

If you run the igp as well yes the unit will certainly throttle.

I think the question is more "Will the CPU throttle during tasks I will place on it?"

I was thinking, if I got the unit with the i3 in it, I could run Distributed Computing on it, and with AVX2.0, a 2.0Ghz i3 would be faster than my 3.6Ghz G3258, and lower power to boot.

But you are saying, if I was watching an H.264 1080P movie, and doing DC on two out of four threads, then it would likely throttle? If so, then it would be pointless to purchase the i3, I guess.

 

[VirtualLarry]

I would hope that buy now you'd have learned from your past mistakes of getting underpowered components only to complain about them and replace them a couple weeks later. What is it you plan on doing that will cause the i3 to throttle and be only as fast as a Celeron?

Do yourself a favor and get the i3 and put this tired routine of buying crap and replacing it with crap behind you. It's time to move on.

I want the i3 (or possibly the i5, if it comes out soon enough, and isn't significantly more expensive).

But if it's just going to throttle / crash on me, then I shouldn't waste my money on it.

PS. I haven't replaced anything I've bought "a couple week later". I had my NanoPCs (one of them, at least) functioning as a HTPC for several months, and then used it as a desktop with a fan blowing into it, for a month after that.

 

[ShintaiDK]

Why dont you just drop distributed computing? Or pay some cloud provider to run it for you, that would be cheaper and more efficient.

To buy a 15W part just to run distributed computing is directly stupid.

How many threads, money and hardware have you been through now, just in the hunt of what? Distributed computing but without too high energy cost?

 

[2is]

Point being, you've replaced just about everything you've bought a short while after you bought it, the last time something lasted you a while was what? Your Q6600? Which at the time was an awesome processor. I suppose if you enjoy doing what you've been doing the last 3 or so years then go for the celeron. If you want to have something you aren't going to want to replace soon after buying it, you know what you need to do.

 

[VirtualLarry]

Why dont you just drop distributed computing? Or pay some cloud provider to run it for you, that would be cheaper and more efficient.

I don't see how paying a cloud provider for their profit, is somehow cheaper for me.

To buy a 15W part just to run distributed computing is directly stupid.

I'm sure that the developers and users of DC software for Android tablets and phones, appreciate the sentiment, that you cannot run DC on a low-wattage part.

How many threads, money and hardware have you been through now, just in the hunt of what? Distributed computing but without too high energy cost?

Just because YOU think DC is stupid, doesn't mean that everyone does.

I was looking at purchasing a Cubi. As I explained, they currently come in Celeron, Pentium, and i3 models. The i3 has AVX2.0, which is useful for distributed computing software.

If I can successfully run DC (AVX 2.0 sustained loads), without throttling or crashing, then I'll get the i3. If I can't, then I'll save my money, and just get one of the lesser models and forgo the DC on the Cubi.

I didn't ask for a critique of my purchasing decisions, nor whether or not it's wise to run DC on a Cubi, only if it is technically capable.

I ran Einstein@Home sucessfully on my E1-2500's iGPU, without slowing down my PC, nor causing any throttling or excessive power draw. It completed one WU in around 24hrs. (My 7950 can do one in like 2-3hrs, I think.)

If it weren't that the E1-2500 was so slow in doing regular desktop tasks, I would likely still be using it.

The Cubi, being a Broadwell "big core", is not likely to have the same sort of slow issues as the E1-2500 Kabini. Especially if I size it appropriately.

 

[VirtualLarry]

I guess what I'm really trying ask is, are Broadwell CPUs under-specced, like Haswell CPUs were, in respect to TDP, cooling, and AVX2.0. Haswell desktop CPUs would throttle under stock cooling, when running sustained AVX2.0 loads (Prime95 with AVX, etc.) If Broadwell CPUs still haven't fixed that defect, then it would be pointless to get a Broadwell CPU that has AVX2.0 support.

 

[ShintaiDK]

They never throttled below baseclock. It was just a matter of turbo modes. And those even reaching 100C was due to faulty BIOS implementation as stated previously by Intel.

However since you want to buy an OEM part, who knows how it will react. Ask the OEM.

http://ark.intel.com/products/84695/Intel-Core-i3-5005U-Processor-3M-Cache-2_00-GHz

cTDP is supported after all.

 

[VirtualLarry]

However since you want to buy an OEM part, who knows how it will react. Ask the OEM.

http://ark.intel.com/products/84695/Intel-Core-i3-5005U-Processor-3M-Cache-2_00-GHz

cTDP is supported after all.

I had looked it up a few days ago, and also noticed that cTDP Down was supported. I wonder if that's implemented in the MSI Cubi BIOS.

I guess I need to have some conversations with someone at MSI, for some of my detailed use-cases.

That, or just buy it, and then I can rant on the forums yea or nay about it.

 

[coercitiv]

I guess what I'm really trying ask is, are Broadwell CPUs under-specced, like Haswell CPUs were, in respect to TDP, cooling, and AVX2.0. Haswell desktop CPUs would throttle under stock cooling, when running sustained AVX2.0 loads (Prime95 with AVX, etc.) If Broadwell CPUs still haven't fixed that defect, then it would be pointless to get a Broadwell CPU that has AVX2.0 support.

My Haswell 4510U maintains base clocks (2.0Ghz) under Prime 95 v28.5 Small FFT torture test (v28.x uses AVX2). Broadwell uses significantly less power than HW at 2Ghz. Does that answer your question?

 

[VirtualLarry]

My Haswell 4510U maintains base clocks (2.0Ghz) under Prime 95 v28.5 Small FFT torture test (v28.x uses AVX2). Broadwell uses significantly less power than HW at 2Ghz. Does that answer your question?

That's a positive report, thanks. It doesn't answer my question 100%, because your rig is Haswell, and I'm asking about Broadwell, but it's definitely a step in the right direction.

 

[Dufus]

i7-5500U running Linpack

Performance increase from power limiting can be had a number of ways, undervolting the most common, but will ultimately depend on the hardware power delivery and cooling solution.