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[Laptopmag] Thunderbolt Graphics Technology Turns Your Ultrabook Into a Gaming Rig. - Page 4

post #31 of 68
Edit: for those who remember, the Sony Vaio Z uses a lightpeak-based (thunderbolt) GPU. IIRC, reviews said that it lost some of it's power compared to internal versions of the same card (and it isn't a high-end, data-hungry GPU).
Quote:
Originally Posted by DuckieHo View Post

PCIe and Thunderbolt are packet-based though. I am not 100% of the specification but there is most likely some identifier for ordering. The signals will remain deterministic and PCIe traces do not have to be as exact as memory traces.
The wave propagation speed of an electrical signal 1m is around 4-6ns. PCIe latency is 250-1000ns so the latency impact is marginal.

1 second / 3000000000 (3GHz clock) = 3.33E-10 parts of a second

That's still thousands of CPU cycles which is an eternity when considering that there's GPU and CPU latencies to add to that.
Quote:
Originally Posted by lordikon View Post

Great article showing how vastly different latencies are over different I/O methods.
http://architects.dzone.com/articles/every-programmer-should-know
Quote:
Lets multiply all these durations by a billion:

Magnitudes:

### Minute:
L1 cache reference 0.5 s One heart beat (0.5 s)
Branch mispredict 5 s Yawn
L2 cache reference 7 s Long yawn
Mutex lock/unlock 25 s Making a coffee

### Hour:
Main memory reference 100 s Brushing your teeth
Compress 1K bytes with Zippy 50 min One episode of a TV show (including ad breaks)

### Day:
Send 2K bytes over 1 Gbps network 5.5 hr From lunch to end of work day

### Week
SSD random read 1.7 days A normal weekend
Read 1 MB sequentially from memory 2.9 days A long weekend
Round trip within same datacenter 5.8 days A medium vacation
Read 1 MB sequentially from SSD 11.6 days Waiting for almost 2 weeks for a delivery

### Year
Disk seek 16.5 weeks A semester in university
Read 1 MB sequentially from disk 7.8 months Almost producing a new human being
The above 2 together 1 year

### Decade
Send packet CA->Netherlands->CA 4.8 years Average time it takes to complete a bachelor's degree


Thanks to lordikon for posting.
Edited by hajile - 9/11/12 at 12:06pm
post #32 of 68
Quote:
Originally Posted by kubed_zero View Post

So you're telling me it's just going to plug in to a wall and draw 200 watts of power, while discharging 200 watts of heat, and that will be okay?


i'd deal with it if i can do SLI/Crossfire
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post #33 of 68
Quote:
Originally Posted by hajile View Post

1 second / 3000000000 (3GHz clock) = 3.33E-10 parts of a second
That's still thousands of CPU cycles which is an eternity when considering that there's GPU and CPU latencies to add to that.
Thanks to lordikon for posting.

But we are talking about orders of magnitude (which those numbers demostrates). The software, GPU, and interconnect latency already dominate the total latency so 4-6ns increase latency will have marginal impact. Sure, thousands of additional CPU cycles are wasted but take that into prespective that millions of cycles are wasted already.

Some latency numbers: http://www.hypertransport.org/docs/wp/Low_Latency_Final.pdf

The cable latency won't be the issue.... it would be the software overhead that probably will have more of an impact anyways.
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post #34 of 68
Quote:
Originally Posted by RussianGrimmReaper View Post

A setup like this could theoretically replace my desktop. Imagine if you will, in a world, where I have a nice dockable laptop, let's say a Dell Latitude E6430 with backlit KB (SO MUCH WANT). This laptop can come with up to 8GB RAM, an i7 IVB processor, solid state, and IPS panel. Now imagine the dock I have has a thunderbolt port and all of my gaming peripherals are plugged into the dock.
If I want to game, all I do is dock the laptop, and I've instantly replaced my $1.5k rig. When I'm done gaming, and say, have to go to work because one of my servers at work broke down, all I do is undock, and I have a business class laptop with 8+ hours of battery life I can waste while inside the datacenter. Then when I'm done, I go back home, take a nap, dock my laptop, and start gaming again biggrin.gifthumb.gif

why wouldnt you just buy a portable hard drive to take with you so you can do your work on a lower end laptop.


I'm not saying some people wont want to take advantage of this but for the average joe this eliminates laptop convenience.
post #35 of 68
Quote:
Originally Posted by Mattbag View Post

why wouldnt you just buy a portable hard drive to take with you so you can do your work on a lower end laptop.
I'm not saying some people wont want to take advantage of this but for the average joe this eliminates laptop convenience.

I'm not understanding where the external drive is coming from confused.gif The purpose of this is to replace gaming desktops by providing similar class GPU performance when at a desk so the laptop can be smaller when not at a desk.
post #36 of 68
Quote:
Originally Posted by JunkoXan View Post

similiar to MSI's little toy that does the same thing but only able to use 1 six pin based video card redface.gif

Is that for sale? I'd like an external HD 7850, since that's superior to what I have right now and only requires one 6-pin connector.
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post #37 of 68
Quote:
Originally Posted by GuardianDuo View Post

Is that for sale? I'd like an external HD 7850, since that's superior to what I have right now and only requires one 6-pin connector.

not that i know of i only saw the concept of it but if this catches on more then MSI may put that concept into a actual device uses the same thunderbolt interface and such.
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post #38 of 68
Quote:
Originally Posted by krabs View Post

"Gaming Rig" term are abused too much, even crappy alienware with nividia 545 OEM is called gaming rig.

gaming rig is defined as a computer that is capable of games/ dedicated to games

even a 545 oem is capable of modern games if you lower the details, you dont have to play everything at ultra you know
post #39 of 68
Just so people know, a few weeks ago I emailed MSI asking when the GUS II would most likely be released, and I was told second half of 2013. I don't know what's preventing manufacturers from bringing thunderbolt eGPUs to market, but there's something going on with them that we don't know. Once they are out though, it's going to be really fantastic for all the people rocking thunderbolt on their laptops thumb.gif

Also it should run just as well with linux as if it were located inside the computer (not talking about speed, but talking about difficulty of getting it to work) because of how thunderbolt works. So no time-intensive, complicated stuff like what I'd have to do to get graphics switching enabled on this MBP! biggrin.gif

And for games, a high-end current generation laptop CPU is overkill, so more graphics horsepower can get rid of that bottleneck.
post #40 of 68
But will it run Crysis? smile.gif
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