Difference between Pentium and Core i7

[GoBroadwell]

Hello World!

 

I would like to ask how Intel made Pentium and Core i7's single-core performance different. They are both Haswell-based. 

 

Let's setup a scenerio:

All technologies by Intel that might make this test fuzzy have been disabled on the i7. (e.g. Hyper-Threading, SpeedStep (Turbo Boost))

Only one core of the Pentium and Core i7 CPUs are enabled.

They have both been set to the same frequency.

They are set to the same amount of L2 and L3 cache.

They are then benchmarked.

 

 

Is Pentium is going to win this benchmark or Core i7 will? Why?

 

 

P.S.: My forum username is from my Minecraft username.

[ADZ_123_!"£]

I believe that the I7 will have the higher IPC (instructions per core) than the pentium.

[jamie.k.hofer]

I have no idea, but I think that maybe the Pentiums have less IPC's.

[FireFox]

I believe that the I7 will have the higher IPC (instructions per core) than the pentium.

 

If they are the same architecture and clockspeed the IPC on both CPU's should in theory be about the same unless Intel has artifically reduced on the Pentium.

[Peter Vaughan Truslow]

Hello World!

 

I would like to ask how Intel made Pentium and Core i7's single-core performance different. They are both Haswell-based. 

 

Let's setup a scenerio:

All technologies by Intel that might make this test fuzzy have been disabled on the i7. (e.g. Hyper-Threading, SpeedStep (Turbo Boost))

Only one core of the Pentium and Core i7 CPUs are enabled.

They have both been set to the same frequency.

They are set to the same amount of L2 and L3 cache.

They are then benchmarked.

 

 

Is Pentium is going to win this benchmark or Core i7 will? Why?

 

 

P.S.: My forum username is from my Minecraft username.

in this scenario they should be matched, but I don't know of any way of reducing the amount of L3 cache that a processor uses, which is a major feature of the i7 over other options(and the only feature over i5 in notebooks)

[ADZ_123_!"£]

If they are the same architecture and clockspeed the IPC should in theory be about the same unless Intel has artifically reduced it but obviously the Core i7 has two extra cores and hyperthreading and so on so.

Apart from the more cores I thought that when you bought an I7 it did have a higher IPC.

[FireFox]

Apart from the more cores I thought that when you bought an I7 it did have a higher IPC.

 

Unless Intel has knocked the Pentium down at the end of the day they share the same exact cores. Core i7 obviously has more cores and hyperthreading but on a single threaded point of view at the same clockspeed they should be the same.

 

You buy the Core i7 for the extra cores and extra features and not the IPC because it should be the same.

[harrynowl]

Apart from the more cores I thought that when you bought an I7 it did have a higher IPC.

No, it's still based on the same Haswell architecture. IPC is identical.

 

Anyway @GoBroadwell I did this a while ago, I ran both my Pentium and i5 at the same clock and on 1 core only.

 

As you can see the G3258 and i5 score basically the same (within the margin of error).

[ADZ_123_!"£]

Unless Intel has knocked the Pentium down at the end of the day they share the same exact cores. Core i7 obviously has more cores and hyperthreading but on a single threaded point of view at the same clockspeed they should be the same.

 

You buy the Core i7 for the extra cores and extra features and not the IPC because it should be the same.

Ok.

[Tim Drake]

Me and @Gofspar did a test between our i5 Haswell and his i7 Ivy Bridge with HT off and I THINK he still got the same or more score than me.. Which means it must improve only if I remember correctly though

 

Knowing me I remembered wrong lmao

[Peter Vaughan Truslow]

one thing to keep in mind that many of the advancements (hyper threading, smart cache) don't directly increase core performance, increase the amount of time the CPU is doing it's thing crunching numbers. hyper threading is like eating with two hands instead of one. you still only have one mouth, but you can eat faster with both hands. large levels of smart cache allow the CPU to stop to fetch data from the RAM less often, as it can hold work in the cache instead of having to put data back in the RAM that it will need only a short time later.

the cores themselves should be the same, if these features are disabled, the only problem is disabling cache.

[Dzzope]

Didn't Luke do a video on this not so long ago? Can't remember if he compared only old or some different modern CPU's though.

[NumLock21]

On very old board you can actually disable the L1 and L2 cache on the CPU, haven't bother to check out if that is possible on the new ones, but even if you can, the number of cache in a CPU cannot be changed. Core i7 has 8MB, in the bios you cannot set it up to 3MB, so it matches with a Pentium G3258 which has just 3MB of cache. The options for the cache is either enable or disable.

[Johannes_Lazor]

[GoBroadwell]

Makes sense... but one thing:

 

What makes this single-core benchmark webpage meaningful?

 

http://www.cpubenchmark.net/singleThread.html

 

You can see that Intel Xeon E3-1285L v3 @ 3.10GHz got a score of 2343, and Intel Core i5-4670S @ 3.10GHz got a score of 1913. Is it the Turbo Boost frequency and Hyper-Threading that is causing the difference? 

[NumLock21]

Makes sense... but one thing:

 

What makes this single-core benchmark webpage meaningful?

 

http://www.cpubenchmark.net/singleThread.html

 

You can see that Intel Xeon E3-1285L v3 @ 3.10GHz got a score of 2343, and Intel Core i5-4670S @ 3.10GHz got a score of 1913. Is it the Turbo Boost frequency and Hyper-Threading that is causing the difference? 

 

Possiblility, but the test did not say HT was disable or not on the Xeon. I'm guessing it's not because they're just running to see which as the best performance, not for finding out the question that your asking. For CPUs, there are hundreds of cores on a single silicon waffle. cores that are the best gets the Xeon name, then it goes down to Core i7, i5, i3, Pentium, and Celeron.

[GoBroadwell]

So, the answer to my question would be,

 

Technically, they are the same, but Core i7s get more quality on cores, and Pentiums get less quality on cores, so usually Core i7 performs better than Pentium per core in real life.

 

[Blackie Sheen]

So, the answer to my question would be,

 

Technically, they are the same, but Core i7s get more quality on cores, and Pentiums get less quality on cores, so usually Core i7 performs better than Pentium per core in real life.

Not really. Just look again at the @harrynowl post. They all have the same IPC. The only thing that would make the i7 faster is the vitual cores given by hyper-threading. Ad one more  question I would like to ask: Why are you asking yourself this question?How of curiosity?

[GoBroadwell]

Not really. Just look again at the @harrynowl post. They all have the same IPC. The only thing that would make the i7 faster is the vitual cores given by hyper-threading. Ad one more  question I would like to ask: Why are you asking yourself this question?How of curiosity?

I wanted to say "per thread".

[Blackie Sheen]

I wanted to say "per thread".

well per thread, they are the same then just like I said earlier and many other said. And my question still stands? Why do you want to know this? Curiosity is a perfectly fine answer