What's new
  • Please do not post any links until you have 3 posts as they will automatically be rejected to prevent SPAM. Many words are also blocked due to being used in SPAM Messages. Thanks!

Zen 3 Announcement Live

Entz

Well-known member
Joined
Jul 17, 2011
Messages
1,870
Location
Kelowna
Their 640 single thread score on CB20 was pretty impressive. I think I'll probably get a 5950X... but we'll see how things fare. I want a top binned chip this time around though. My 3900X is a really poor sample it seems, and with the move to 8-core chiplets, that means the "bad" dies are being used in the 5600/5900?
This is something I am wondering. For something like the 5800X is it 1 CCX or 2-4 core? Is the 5900 2-6C or 1-8+1-4 . The performance implications could be high.
 

Mr. Friendly

Well-known member
Joined
Nov 21, 2007
Messages
6,782
Location
British Columbia
Their 640 single thread score on CB20 was pretty impressive. I think I'll probably get a 5950X... but we'll see how things fare. I want a top binned chip this time around though. My 3900X is a really poor sample it seems, and with the move to 8-core chiplets, that means the "bad" dies are being used in the 5600/5900?

The little Radeon tidbit towards the end there looks like they're just barely keeping up with a RTX3080... that was a bit disappointing but I guess we've all kinda been suspecting that.
well...it's nice if you're in the lead...but realistically, everyone should be on par, so if it's performance is the same as Nvidia, it's still a win.
 

Dwayne

Well-known member
Joined
Aug 17, 2008
Messages
1,470
Location
Courtenay, BC
The little Radeon tidbit towards the end there looks like they're just barely keeping up with a RTX3080... that was a bit disappointing but I guess we've all kinda been suspecting that.

I think the top end "Big Navi" will be around 15% faster than a 2080 Ti. I believe they said the teaser was a 5900X with a "6000 series" card, so no specific number though. I can't imagine they used a lesser card, but I guess the possibility is there. The small bump from the 5900X would have helped the frames perhaps?

Anyway, it will come down to price and availability I think. If they push out a top end card between a 3080 and 3070 but price it in the middle at $599, and they actually have stock, they will get buyers.
 

Izerous

Well-known member
Folding Team
Joined
Feb 7, 2019
Messages
1,781
Location
Edmonton
two back to back uplifts like that 15% -> 19% (iif accurate) is very encouraging. And pricing is nice to not see a huge spike in MSRP. If inventory levels don't plague this release and performance numbers are accurate would like to swap out the 2700x for a 5900x, 5950x is unlikely strictly due to price.
 

Bond007

Well-known member
Joined
Jun 24, 2009
Messages
6,244
Location
Nova Scotia
This is something I am wondering. For something like the 5800X is it 1 CCX or 2-4 core? Is the 5900 2-6C or 1-8+1-4 . The performance implications could be high.
I am pretty sure I read in anandtech’s write up that 5800X is 1x8core ccx, and 5900X is 2x6core cxx.
 

Entz

Well-known member
Joined
Jul 17, 2011
Messages
1,870
Location
Kelowna
I am pretty sure I read in anandtech’s write up that 5800X is 1x8core ccx, and 5900X is 2x6core cxx.
Thanks I may have missed it, I just skimmed over it quickly. That would make the most sense. That would also mean the 5900X would have a huge cache advantage as it would mean 32MB L3 per 6-core CC for the total of 64MB...
 

Bond007

Well-known member
Joined
Jun 24, 2009
Messages
6,244
Location
Nova Scotia
Can't all cores access all cache now? I think that's the notable design change with Zen 3 isn't it?
Yes, but with latency. The current setup is each chiplet has 2xCCD. Each CCD has 4 cores and 16mb of cache. If you do something lightly threaded it has latency to access more than its default 16mb, but can get access to the rest. Zen 3 is a cluster of 8cores with 32mb.

You can see the effect if you look at some ryzen 3 3100 vs 3300X reviews. They both have one chiplet, but the 3100 is 2cores per ccd (2+2), whereas the 3300x is 4 cores in a single ccd (4+0). That same effect (difference between the 3100 and 3300X) is kind of a scaled effect of what they have done with zen 3.
 

Entz

Well-known member
Joined
Jul 17, 2011
Messages
1,870
Location
Kelowna
Can't all cores access all cache now? I think that's the notable design change with Zen 3 isn't it?
Yes. However there is only 32MB L3 per CCD. So the 5800X shares that 32MB between 8 cores, where as the 5900X shares the same amount between 6 cores (for a total of 64MB across the 2 CCDs).

It really depends on your workload, how the core loading algorithms works and how independent the datasets are. For example, take a affinity masked 8 core load that has independent memory segments. On the 5800X this would be 8 cores sharing 32MB of L3, on the 5900X you would have 4 cores using 32MB and another 4 cores using 32MB (split across the 2 dies). Which is basically doubling the amount of L3 it can use. Even 6+2 vs 8 would be an advantage.

Now if your running a 8C heavy workload, then it is way more complex as your talking about L3 size vs latency etc. That may favor the 5800X.

I will be really interesting if they improved cross CCD performance (higher IF clock?)
 

Dwayne

Well-known member
Joined
Aug 17, 2008
Messages
1,470
Location
Courtenay, BC
Heh, I didn't notice that they dropped the heatsink in addition to increasing the price of the 5900X and 5800X.
 

Attachments

  • diy cooling.jpg
    diy cooling.jpg
    241 KB · Views: 4

Latest posts

Twitter

Top