You are currently viewing our boards as a guest, which gives you limited access to view most discussions and access our other features. By joining our free community, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content, and access many other special features. Registration is fast, simple, and absolutely free, so please, <a href="/profile.php?mode=register">join our community today</a>!
May seem so, but the cache sizes are confirmed here (and 1.648 V?)
Today officials (AMD) said that 45nm chips would consume 15% less energy(even tho they feature 3x more L3 cache,so it's not a straight die shrink from 65nm) than 65nm parts,i presume per same clock.This explains the HKEPC slide claiming TDP drop from 125 to 95W for top speed bins(65nm-> 45nm).
This result is under the expectations (20%) even with two times the cache on die. We'll see the other news in this cpu, for example a full speed L3 can give more watts to the power budget, a better IMC can be hotter....who knows. What matters is the performance, we'll see.
One thing is sure, Shanghai and Nehalem are BIG chips for a large consumer production, IMO a die size of 250/260 mm2 is not the right solution for a good profit. Both companies need of a strategic rethink.
Joined: Wed Jun 27, 2007 10:19 am Posts: 324 Location: Milano, Italy
Alberto wrote:
One thing is sure, Shanghai and Nehalem are BIG chips for a large consumer production, IMO a die size of 250/260 mm2 is not the right solution for a good profit. Both companies need of a strategic rethink.
Both companies will keep their dual-core offerings and IMHO that will still make most of the volumes. Dual-cores already provide very little benefit to end users, quad-cores are simply worthless unless, especially so in laptop offerings where they have the burden of a larger power envelope.
Does anyone know what we can expect from Shanghai performance wise? Will it address whatever issues were plaguing Barcelona?
Barcelona was a huge letdown for me. I wanted to go back to AMD, but the performance just wasn't there.. :(
What the hell happened with Barcelona anyhow? It's barely faster than the K8!
I wouldn't expect much of a frequency boost from AMD's 45 nm process however this will be AMD's second crack at this microarchitecture so they should be able to squeeze critical paths based on their experience with the original 65 nm version. AMD should be able to ship quad server parts at 2.6 GHz in 45 nm, maybe 2.8 GHz if they push really hard.
Not that I particularly know what I'm talking about but isn't a design's layout optimised for the process node which the product will spend most of it's life on, that being 45nm for the K10H (or whatever people want to call it)? Considering the original 65nm design was expected to reach 2.8GHz under a 95 watt TDP and is obviously suffering some serious speed issues do you really hold such little hope for competative clocks?
Alberto,Shanghai won't be in 250mm2 range..It will be around 146-160mm2 and a lot smaller than Nehalem Quad Core part.
You mean 270 mm2 range ;-)
You are wrong, look at the die photo. Shanghai is around a 18.8X14.2 mm2 cpu if you make a calculation on the core die size: old core around 25.5 mm2, new 45nm core 25.5X0.7= 17.8 mm2. About sram cells, they are pretty big aka around 11.5-12 mm2/ MB, i don't know the reason, maybe to lower the leakage.
Your figure is for a L3 free quad core cpu, but it sounds like an useless AMD celeron. Moreover Intel can ship a Nehalem without L3, so where is the problem?
a little less than 21 cpus in vertical, a little less than 16 cpus in orizontal
or a little less than 336 dies on a 300X300= 90000 mm2 area:
Shanghai is a 260/270 mm2 cpu.
CPU-z can't read Vcore correctly with Shanghai. Today officials (AMD) said that 45nm chips would consume 15% less energy(even tho they feature 3x more L3 cache,so it's not a straight die shrink from 65nm) than 65nm parts,i presume per same clock.This explains the HKEPC slide claiming TDP drop from 125 to 95W for top speed bins(65nm-> 45nm).
Joined: Wed Jun 27, 2007 1:07 am Posts: 26 Location: Amsterdam
Hans de Vries wrote:
Time for an update with Shanghai pictures and a Nehalem picture not so obscured by wiring.
Regards, Hans
Excellent work Hans! What strikes me is the L3 cache density. Why is the AMD L3 cache about the same as L2? It's not like it's very fast, if you think of Barcelona...?
Joined: Wed Jun 27, 2007 10:19 am Posts: 324 Location: Milano, Italy
Michael Westman wrote:
Excellent work Hans! What strikes me is the L3 cache density. Why is the AMD L3 cache about the same as L2? It's not like it's very fast, if you think of Barcelona...?
I seem to remember that they basically reused the cells designed for the L2 and yeah, it's not very fast.
Users browsing this forum: No registered users and 0 guests
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum
