Lga775 Motherboard

[Irma Tchakian]

Yesterdayi made a thread about Socket 478 motherboards with PCI-E slots, but i decided to some some more research and make a list of the oposite, LGA 775 motherboards with AGP Slots, these are more common than Socket 478+PCI-E mobos, but also interesting at some point

Some Intel 865 and VIA chipsets boards might support Dual Core, 65 nm CPUs or even Core 2, but it depends of the motherboard model. There are at least vey few boards with Core 2 Quad Support (AsRock 775i65G R2.0/3.0 and AsRock ConRoe865PE afaik). Ethier way, check CPU support of the motherboard

WARNING - NON AGP chipsets:

These are boards which seems to have AGP, but is not actually AGP, but rather an implementation of it using PCI bus or PCI-e bus, they are not real AGP slots, these slots don't run as well as real AGP slots and they have also compatibility issues, they generally use non AGP chipsets. I would recomend avoiding them if you want to build an AGP rig.

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Hi I've got rev 1.0 of ECS 865PE-A7 board that officially supports only 90 nm P4/Celerons and must note that without modified bios I'm now running 65nm Pentium 4 651 3.4/800 in it. EIST and hyperthreading works OK. Maybe it could handle some Pentium D, but I wouldn't risk anything higher than 9xx with 95W TDP.

Thanks guys for this topic, I found it via google. It is really great and has lots of useful info. I collecting rare hardware and it just gave me an idea, that I also need the latest and fastest AGP motherboard. I just ordered an ASRock 775i65G R3.0 motherboard, since it is cheap and still available as new! Maybe I will just keep now in box unopened or later I will setup with a Voodoo 4.

The socket had an unusually long life span, lasting 7 years until the last processors supporting it ceased production in 2011. The socket was superseded by the LGA 1156 (Socket H) and LGA 1366 (Socket B) sockets.

LGA 775 was the last Intel socket for desktops for which third-party companies manufactured chipsets. Nvidia was the last third-party manufacturer of LGA 775 chipsets (its final product was MCP7A family, marketed as GeForce 9300/9400, launched in October 2008), as other third-parties discontinued their products earlier. All chipsets for superseding sockets were exclusively designed and manufactured by Intel, a practice later also adopted by AMD when they first launched APUs in 2011 (Socket AM3+ processors, also launched in 2011, were usually paired with motherboard with AMD chipsets, but some motherboards using third-party chipsets were also manufactured, usually with Nvidia chipsets, as the Socket AM3+ design was directly extended from the earlier Socket AM3 design).

The force from the load plate ensures that the processor is completely level, giving the CPU's upper surface optimal contact with the heat sink or cold-water block fixed onto the top of the CPU to carry away the heat generated by the CPU. This socket also introduces a new method of connecting the heat dissipation interface to the chip surface and motherboard. With LGA 775, the heat dissipation interface is connected directly to the motherboard on four points, compared with the two connections of Socket 370 and the "clamshell" four-point connection of Socket 478. This was done to avoid the reputed danger of the heat sinks/fans of pre-built computers falling off in transit. LGA 775 was announced to have better heat dissipation properties than the Socket 478 it was designed to replace, but the Prescott core CPUs (in their early incarnations) ran much hotter than the previous Northwood-core Pentium 4 CPUs, and this initially neutralized the benefits of better heat transfer. However, the later Core 2 processors run at much lower temperatures than the Prescott CPUs they replaced.

Processors with lower TDP and clock speeds only used Thermal Interface Compound in between the die and the integrated heat spreader (IHS), while processors with higher TDP and clock speeds have the die soldered directly to the IHS, allowing for better heat transfer between the CPU and the integrated heat spreader.

All LGA 775 processors have the following mechanical maximum load limits which should not be exceeded during heat sink assembly, shipping conditions, or standard use. Load above those limits could crack the processor die and make it unusable. The limits are included in the table below.

The transition to the LGA packaging has lowered those load limits, which are smaller than the load limits of Socket 478 processors but they are bigger than Socket 370, Socket 423 and Socket A processors, which were fragile. They are large enough to ensure that processors will not crack.

Intermediate chipsets (e.g. Intel 945) commonly support both single core Pentium 4-based CPUs as well as dual core Pentium D processors. Some motherboards using the 945 chipset could be given a BIOS upgrade to support 65nm Core-based processors. Other chipsets have varying levels of CPU support, generally following the release of contemporary CPUs, as LGA 775 CPU support is a complicated mixture of chipset capability, voltage regulator limitations and BIOS support. For example, the newer Q45 chipset does not support NetBurst-based CPUs such as the Pentium 4, Pentium D, Pentium Extreme Edition, and Celeron D.

Some Core 2 and other LGA 775 processors are capable of hardware-accelerated virtualization. However, more recent hypervisors might not be compatible with these CPUs because they lack support for Extended Page Tables.

But to increase the reuse value for this question, an overview of the whole family of CPUs for this socket would be welcome as my research shows this proves to be an extremily confusing area of hardware.

Your motherboard supports at least a TDP of 115W, given it lists the P4-672 on ASUS's supported CPUs page. Conservatively, we will use this as our upper bound on acceptable TDP. We need to be careful here because while it may be possible to put a CPU with a higher TDP than this into your board and have it run, it may also do damage to the board, ultimately rendering your system inoperable.

Only you can determine your BIOS revision, but luckily this is not hard to do - you can check was BIOS revision you have, then go through ASUS' approved method of flashing the BIOS (if necessary) to the most recent revision: 1015.

The chipset of your motherboard is, per ASUS, the Intel 915G Express. As @harrymc stated in the comments, www.cpu-upgrade.com is a wonderful, inerrant source on this sort of thing, and that site provides us with a much-expanded support list for that chipset. This site operates quite a bit on experimentally verified information, using a wiki-like approach; if you see a green checkmark next to a CPU listing, that means it was actually physically attempted and succeeded. Experiment like this does leave lacuna, but overall, the lists are very complete. Additionally, because the site exists for people looking to upgrade, you can bet that people will be trying all the potential CPUs which are possibly the best on a given chipset, because that would be the best thing to find.

The support list also resolves our last problem - only 800mhz FSB or lower CPUs are listed. The last BIOS udpate, while not listed on that series of supported CPUs, is from 2007, which pretty well puts a limit on what might work on your system - and the few Allendale dual core pentiums that might in theory work on your socket probably won't due to large architecture differences which would prevent them from playing nice with your chipset.

The most performative CPU for you, without taking into consideration overclocking, would therefore be the Intel Pentium 4 672. At 3.8ghz with HT, 64-bit OS support, and 2mb of L2 cache, it seems to me the best possible option.

Anecdote Time: Pentium D's may work, because they are basically two P4's bolted together, but I don't think it is likely. In any case, they wouldn't offer much additional performance over the best proven option. They might also run at a reduced capacity; I have had a situation on 775 before where I was able to kinda-sorta run a Core 2 Quad 8200 on a system that previously had an older Core 2 Duo in it, but because the BIOS microcode didn't know about that chip it wasn't able to fully utilize its capabilities, and the system ran slower than it should have. More specifically, I didn't even get to the point of checking how things ran in an OS - the POST was so painfully slow that I cancelled all attempts to move forward with the install and simply replaced it with an older core 2. I believe it was running at a lower than usual frequency and not all of its cache was recognized, or something along those lines. I also got an annoying little message from the BIOS it every time I booted.

Regarding your specific inquiry about Cedar Mill. Cedar Mill is actually just a die-shrink of the same Netburst architecture. If you use the resources I gave you, you can see that while your chipset supports those chips, your motherboard doesn't. This is most likely due to microcode updates needing to be made to the BIOS which were not made by Asus. To me that says in all likelihood they should run in your computer. You may get issues about it during POST, though.

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