Cookies op Tweakers

Tweakers maakt gebruik van cookies, onder andere om de website te analyseren, het gebruiksgemak te vergroten en advertenties te tonen. Door gebruik te maken van deze website, of door op 'Ga verder' te klikken, geef je toestemming voor het gebruik van cookies. Wil je meer informatie over cookies en hoe ze worden gebruikt, bekijk dan ons cookiebeleid.

Meer informatie

Door , , 1 reactie
Bron: Silicon Insider

Silicon Insider heeft een behoorlijk diep artikel gepost waarin ze de architectuur van de door Intel en HP zwaar overhypete Itanium vergelijken met die van de Alpha EV67. Hier een stukje:

The size disparity between the two processors strongly suggests the EV68 could be manufactured with much a lower silicon variable cost than Merced. Then there is performance. Won't the bigger chip have more functional units and thus higher performance? Well, from a clock frequency point of view, a smaller chip is better because it is easier to distribute a low skew clock across the entire die and propagate time critical global signals. Having lots of functional units will do precious little for performance if the memory hierarchy cannot support them. With only around 16% of its die area devoted to on-chip cache yet more integer and floating point units than the EV68, the in-order execution Merced looks like it might spend a lot of time waiting for data and instructions to arrive from off-chip sources (L3 cache and system bus).

Today the Alpha EV67 provides performance levels up to 39 SPECint95 and 68 SPECfp95 at 700 MHz with higher clock rates promised. Compaq estimates that the EV68 will achieve clock rates in excess of 1 GHz and yield around 65 SPECint95 and 100 SPECfp95. But the latest estimate from MDR is that Merced will clock at 750 to 800 MHz and achieve about 45 SPECint95 and 70 SPECfp95. For a high end 0.18 um processor these results would be good but not outstanding. Certainly not enough to live up to the Intel and Hewlett Packard (Intard?, Hewtel?) hype about EPIC and IA-64. If you mention the MDR Merced performance estimates to some people in silicon valley you elicit a snicker and a reply along the lines of "yeah, when hell freezes over".

Moderatie-faq Wijzig weergave

Reacties (1)

Zag op The Register trouwens een leuke:

Itanic <img src=http://www2.hku.nl/~femme/wot/forum/interface/smilies/devil.gif width=15 height=15>

Op dit item kan niet meer gereageerd worden.



Apple iOS 10 Google Pixel Apple iPhone 7 Sony PlayStation VR AMD Radeon RX 480 4GB Battlefield 1 Google Android Nougat Watch Dogs 2

© 1998 - 2016 de Persgroep Online Services B.V. Tweakers vormt samen met o.a. Autotrack en Carsom.nl de Persgroep Online Services B.V. Hosting door True