7800X3D vs 7950X

[67Elco]

Seen this bantered about on the net without any clear conclusions. Would a 7950X lose any performance vs a 7800X3D in a gaming scenario? The only place a X3D chip tops a 7950X is L3 cache and it isn't by much at all. Right now they are identical in price. At first glance the double cores/threads of the 7950X appears to be a no brainer.

 

[Janus67]

What resolution?

 

[67Elco]

What resolution?

1440

 

[Woomack]

It depends on the game, but in most titles it's +/- the same. What 7800X3D gains because of cache, loses because of much lower frequency.
Most games still don't use more than 4-6 cores properly, so 8 is optimal for gaming nowadays (9800X3D example as the best gaming CPU). If you get a game that uses a lot of cores for calculations, then it will probably run better on the 7950X. However, only a few games scale well with 12-16 cores.
I would still go for the 9000 series, even though it's not much faster.

Here is an older comparison, but it's about the same right now.

 

[67Elco]

Yeah, it's looking like I would never be able to tell the difference by eye. Considering the cost I think I will go with the 7950X next and it will be a more capable cpu if ever needed for something other than gaming. The TDP is higher vs the X3D's, but I can work around that easily enough. Curious how all the benchmarks (gaming) I have seen online show the cpu thermals significantly lower for the 7950X vs all the other X3D cpu's despite having a higher TDP (170W).

Edit: 7950X on the way.

 

[EarthDog]

I have seen online show the cpu thermals significantly lower for the 7950X vs all the other X3D cpu's despite having a higher TDP (170W).

Whatchya looking at?????

Vs 7900 its generally using less power and cooler, nonetheless a 7950x...

AMD Ryzen 7 7800X3D Review - The Best Gaming CPU

AMD's Ryzen 7 7800X3D is everything that gamers want: eight fast cores, in a single CCD, with 3D VCache stacked on top at a price point of $450. In our review we can confirm that 7800X3D is indeed the fastest gaming CPU available, beating Intel's 13900K and even the 7950X3D.

www.techpowerup.com

I'd go 9000 series too... I wouldn't build 7000 series amd anything today (including gpu) if there was budget for 9000 series. But the 7950x is a beast!

 

[67Elco]

What I was talking about earlier concerning the cpu temps of the 7950X vs the X3D cpu's...

 

[Woomack]

It looks unreal. I mean, how can you have lower temps on a 200W+ CPU than on a 120W CPU? Maybe they failed to install the cooler correctly. On the other hand, most of the time, CPUs were loaded in ~20-25%, so they clearly failed something when the 9800X3D had 90C.

 

[67Elco]

It looks unreal. I mean, how can you have lower temps on a 200W+ CPU than on a 120W CPU? Maybe they failed to install the cooler correctly. On the other hand, most of the time, CPUs were loaded in ~20-25%, so they clearly failed something when the 9800X3D had 90C.

I agree it is strange, but I have noticed also the temperature differences between my 7900 vs my 7800X3D as well. Despite the X3D having a additional radiator it always runs hotter in all scenarios vs the 7900. To be fair though the vanilla 7900 is only a 65W TDP cpu...guess I will just have to test this myself with the 7950X. The linked video showed all the X3D cpu's consistantly running hotter than the 7950X...doubtful they had 3 bad cpu installations and only with the X3D cpu's.

 

[EarthDog]

Maybe you and that YTer got bad chips, lol.

I only looked up tests at TPU and Tom's, but they run cooler there.

 

[67Elco]

My cpu has yet to be tested so I think it premature to call it bad lol...different test beds and benchmarks will naturally have different results.

 

[EarthDog]

My cpu has yet to be tested so I think it premature to call it bad lol...

Another video by the same guy...?


I didn't really watch it through, but I can see his temps are, for some reason, all over the place. Around 1:28 the temps are the same (though he doesn't change settings).

What Im gathering is CPU use is different. The 7950X is using significantly less CPU % (b/c more cores) so the chip runs cooler in some situations. This is also running at 4K so the CPU isn't involved as much in the first place. I'd be more interested to see what 1080p looks like,

 

[67Elco]

My experience with X3D cpu's is rather recent, but I always questioned in the back of my mind why it seemed they ran hotter than expected. Turns out the reason is well documented and confirmed from the very first introduction...the X3D cpu's contain a extra layer of silicon that the non-X3D cpu's don't have. This inhibits the transfer of heat. Learn something new every day.

This will be a great help getting that 7950X off to a great start...

 

[EarthDog]

IOhhhhhhh yeah!!!

What's on my mind... the new 9000 series moved the cache up and so now it runs cooler.

 

[67Elco]

Those prices are not cooler...

 

[freeagent]

X3D doesn't run hot.

At least mine and and many others don't.

Just noobs making videos to put on the tube.

 

[67Elco]

X3D doesn't run hot.

At least mine and and many others don't.

Just noobs making videos to put on the tube.

Hotter was the relevant term. X3D design had it built in so to speak vs the non-X3D cpu's because of the extra silicon.

 

[freeagent]

Nah. My X3D is as easy to cool. About as easy as my 5600X, which is pretty easy.. I don't want to throw up a screen, but its sitting at like 20c right now. If I give it all the beans that the socket will allow, then I see under 80c.

Mind you, I don't have a 7950X3D, but my 5900X can do 260w. I just bought a new board, not sure if I want to go X3D this time, or just stick with R9. 7950X3D is a nice CPU, but I will probably roll with Zen 5.

 

[67Elco]

It would appear the point is being missed here somehow. It has never been about a particular temperature of any cpu, but rather the revelation that X3D cpu's were always less efficient at dissipating heat vs their non-X3D counterparts. Btw, I have purchased a 7950X...not a X3D version.

 

[freeagent]

Sorry, I was looking at 7950X3D reviews haha.. my bad.