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Paw
Joined: 06 May 2014
Posts: 2
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 Posted: Tue May 06, 2014 10:01 pm Post subject: Socket 478 CPU with EM64T |
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| Were there any chips for the socket478 that were 64bit for using 64bit software? |
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gg1978
Joined: 31 Jul 2012
Posts: 1052
Location: Indiana, USA
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| Posted: Tue May 06, 2014 10:09 pm Post subject: |
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| nope.. there were S775 P4's that were 32 bit only as well.. |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Wed May 07, 2014 12:22 am Post subject: |
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| Nope. Socket 478 was only 32 bit, period. |
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Paw
Joined: 06 May 2014
Posts: 2
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| Posted: Thu May 08, 2014 12:48 am Post subject: |
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| Okay! That cleared my thinking up....Thank you both! |
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microchip
Joined: 31 May 2014
Posts: 2
Location: Belgium
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| Posted: Sat May 31, 2014 4:53 am Post subject: |
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Hmm, interesting. I always though there was a single P4 model that was 64-bit. Good to know I was mistaken 
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Sat May 31, 2014 7:38 pm Post subject: Re: X64 |
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| Paw wrote: | | Were there any chips for the socket478 that were 64bit for using 64bit software? |
Just searched the CPU-World databese.. if correct then there was 1
SL8JX G1 stepping Pentium 4 2.8MHz/533/1M
if info is correct I'm still not sure how it would go on a standard board whether EMT64 would be enabled
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xsecret
Joined: 01 Feb 2004
Posts: 1847
Location: France
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xsecret
Joined: 01 Feb 2004
Posts: 1847
Location: France
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| Posted: Sat May 31, 2014 9:21 pm Post subject: |
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Here is the result of some investigations :
- There is some EM64T enabled S478s in the database, but very few (< 30 for 3M+ entries)
- 4K+ S478 Pentium 4 with F49 CPUID (G0 Step) : Not a single one reports EM64T enabled
- All EM64T S478s in DB are F41 based P4 (E0 Step).
- All EM64T S478s in DB are 3.20 or 3.40 GHz part, except a single 2.13 GHz
- 5 parts are running on a 64 bit OS. So that really works !
- Asrock P4i945GC seems OK with EM64T. It's NOT a common board (i945 + S478) - http://valid.x86.fr/1194385
- IBM eServer xSeries 206 w/ M71IX Motherboard (S478) support EM64T - http://valid.x86.fr/2634646
EDIT> Seems that you can activate EM64T with a BIOS trick on E0 step S478 but Intel removed that on G0 step. I've checked a complete cpuid dump and for sure, it's enabled on those E0.
EDIT2> Some more investigation later. Mystery parts are probably SL7QB (3.2GHz) & SL7Q8 (3.4 GHZ). Seems to be special OEM parts for IBM w/ EM64T enabled !
EDIT3> Just bought a P4i945GC and a SL7QB for a good price. Will check and report.
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Antinomy
Joined: 29 May 2012
Posts: 243
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| Posted: Wed Jun 04, 2014 12:18 am Post subject: |
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| Very interesting. I've asked Intel tech guys and they said no. The question was about SL7Q8. And if this is true, it's very nice news. |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Wed Jun 04, 2014 1:38 pm Post subject: |
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| News to me, too. I've never seen, in my entire IT career of almost 20 years, a socket 478 system that supported EM64T. |
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misace
Joined: 14 Sep 2012
Posts: 932
Location: Prague, Czechia
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| Posted: Thu Jun 05, 2014 6:37 am Post subject: |
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ECS 865PE-A (V2.0) maybe also supports 64Bit. In Donwload Section -> BIOS you can read "1.Added Intel IA-32e CPU(64bits) support".
http://www.ecs.com.tw/ECSWebSite/Product/Product_Detail.aspx?CategoryID=1&DetailID=429&DetailName=Feature&MenuID=24&LanID=0
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Thu Jun 05, 2014 7:42 am Post subject: |
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Motherboard support is not a problem:
there is cheap 478 to 775 adapter. |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Thu Jun 05, 2014 7:48 am Post subject: |
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| frag_ wrote: | Motherboard support is not a problem:
there is cheap 478 to 775 adapter. |
He was looking for an EM64T capable 478 chip. There are cheap 478 to 775 adapters out there, but that's not the direction he wanted to go. |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Thu Jun 05, 2014 7:55 am Post subject: |
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I answered not to topicstarter,
but to any researcher who want to check 478 cpu
and don't want to hunt for specific motherboard |
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xsecret
Joined: 01 Feb 2004
Posts: 1847
Location: France
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| Posted: Thu Jun 05, 2014 11:57 am Post subject: |
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Depend if the EM64T flag reported by CPUID is WO, RO or RW.
If the flag is Read Only, there is no need for the BIOS to support EM64T. If the flag is WO or RW, default is probably disabled and a BIOS trick might be needed (MSR?). Memory remapping of the PCI Address space over 4G could be mandatory too for EM64T. That requires BIOS support and not many S478 boards have it.
Anyway, I've just received the P4i945GC. Still waiting for the CPU. Can't wait to try 
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