Intel E8435

Does anyone have this chip as an upgrade in their laptops? Any input on this and performance and heat compared to todays cpus? Big difference?

 

Read this:

http://forum.notebookreview.com/har...t-upgrades/485240-e8435-t9900-good-price.html


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the performance is the same as the T9900 but the E8435 runs hotter. There are two types of the E8435, one with an 45W DTP and one with a 55W DTP. The T9900 DTP is only 35W. Thus the T9900 is much cooler than the E8435.

A few people in the forum have tried the E8435. The reported that is was running very hot (90c plus under load).

You should try the E8335. It is similar to the T9800 and has a DTP of 35W only.

 

I was looking at the E8335 but I got a great deal that I couldn't pass up for the E8435. So even with undervolting do you think I can lower the temps?

 

It all depends on how good is your cooling system. Check this out. The OP tested the E8435 and then sold it because it was too hot. You can try. If it is too hot you can always sell it and recuperate your money

 

Sometimes the voltage is actually too high and the notebook wont be able to run it at all or on battery. It may be a software thing tho.

 

The reason the E8435 is a 'great deal' is that no one wants one in their machines.

 

I would opt for the software and more precisely the BIOS. The E8435 is desktop processors so the BIOS won't know how to power manage it properly. Beside since it is a desktop CPU it is normal that it has a higher voltage compared to the T9900

 

Oh my gosh how often do these threads come up. Ok here we go again.

Disregard all of the above that you have heard.

The E8435 comes in TWO flavors: SLAQD and SLGEA. Forget about TDP. It's a very misleading number.

SLAQD is a C0 stepping. It runs hotter than any T series CPU. It's much less efficient at idle and load. Do not get this if you are concerned about heat.

SLGEA is an E0 stepping. It runs hotter than a T series CPU at idle, but at load it will run about the same temp. The reason for this is:

E8x35 CPUs lack DFFS and IDA. DFFS is dynamic FSB frequency switching. It downclocks the FSB on the fly to save power. You'll take a 20-40m battery life hit as a result. IDA is Intel Dynamic Acceleration. It overclocks a core by a 0.5x multiplier under single threaded loads. The BIOS can manage the power just fine. There are no issues since it's the same as a normal C2D minus these features.

This is not a desktop CPU. It's a mobile CPU with features stripped off of it outfitted for iMacs. It's the same core as a T9900 and runs only 0.0125V more than a T9900. The E0 stepping can be undervolted to 1.1000V just fine at stock speeds, and overclock slightly further than a T9900 because of the additional voltage headroom.

PLEASE USE THE SEARCH FUNCTION BEFORE STARTING ANOTHER ONE OF THESE THREADS. (Though I guess this point is moot because anyone who sees this and posts a new thread will not have used the search function.)

 

Thanks!! I noticed you have the E335 version. How was your temps normally without any tweeking? Is the g50 or 51 cosidered it has having a good cooling system? I have the 51 with and zalman cooling pad.

 

Yeah I have the E8335, which is the same as the E8435 but lacks the multiplier. Had I been smart I would have gotten an E8435 but I didn't know the information I posted above at the time... Ah well.

Temps were pretty warm across the board, about +8-10C idle and +12-18C load vs an M0 P8400. My load temps are now about 75C (stock), 68C (undervolt), 80+C (overclock).

The GPU is still the hottest component 80% of the time, and since it's on the same heatsink the CPU heats up the GPU. It's a domino effect but the temps are manageable. Depending on the game you might have to undervolt or underclock something (different games stress hardware differently, CPU/GPU). For example, I can overclock the CPU in League of Legends or Minecraft without issue, but in GRID or Crysis I have to cut back on something. I have an OC'd 260m though, that generates a good bit of heat, too.

The G51 has a better fan than the G50. Both have a single heatsink setup so the cooling is decent but not excellent. The G51 fan definitely keeps things at least 8-10C cooler than the G50 from what I've heard, but I never tested the fan differences myself. (I have a G51 fan)

tl;dr: It definitely gets warmer but depending on your hardware settings YMMV.

 

Any physical modes on the computer itself besides the fan? Like back panel modding? I was thinking additional cooper cubes all over the place. If the cooper falls of and touches something else, will it cause havoc?

 

I added the copper blocks, but I really need to get thermal tape because half of them fall off for whatever reason (the other half of them are fine) and I need to open my computer to fix it.
If the copper sides touch parts together that could be the end of the computer or component. The bottom of the blocks has adhesive though so it isn't conductive there though.

 

Thats only half true... both my E0 step E8335 and E8435 have DFFS/SuperLFM and so they idle at 800MHz. You are right in that they do lack IDA though.

My pick would be the E8335 since it runs lowish stock VIDs, the E8435 has a very high top end VID which makes it run quite hot. It really needs to be undervolted for sensible use, in my case it can run rock stable at 1.125V @3.06GHz.

 

Quads dont have superLFM and they run cooler.

As a tribute to you knowledge and thinking this should be closed for discussion, other than using 'though' twice in the same sentence...

The bottom of the blocks have thermal adhesive. It is where they are meant to be thermally conductive, not anywhere else. I can't imagine how you where trying to use them.

Furthermore its a widely accepted fact that some laptops have limited voltage circuitry, especially HPs. If you get one that doesn't run stable undervolted, also one that doesn't have super LFM, you could quite easily end up with a crappy or useless machine.

 

You're thinking of SpeedStep and SLFM. DFFS is different than SpeedStep... SuperLFM puts the CPU into a 3x multiplier but you'll notice the FSB is always 266MHz (x4 = 1066MHz). DFFS changes the FSB frequency.

I thought both the E8335 and E8435 could maintain stock clocks at 1.10V, but I might just be making that up.

@Niffcreature: haha, that's what I get for editing my posts haha


I was talking about when the blocks fall off of my heatsink/heatpipe. They land on components sticky side down, thank god.

Good point about voltage + OEMs, didn't know that.

 

I just upgrade my vaio from a t6000 -> e8435 E0 stepping..undervolted and now its stable at 6 and 7X multiplier 0.975V, 8X multiplier 0.985V, 9X multiplier 1.000V, 10X multiplier 1.030V and at 11.5X 1.050V.
I notice my voltage are much lower than whats posted here and confirmed with CPU-Z @ 3.06ghz. prime95 for 2 sessions of 30mins and all is stable, heat topping out at 82C.
Lets be honest, I am never likely to ever push my CPU to the lvl of prime95 for 1hr straight. No BSOD