[J. VIRGIL SMITH LETTERHEAD]

                                                                     EXHIBIT 5.1

                                                                  27 August 2003

Marvell Technology Group Ltd.
4th Floor, Windsor Place
22 Queen Street
P.O. Box HM 1179
Hamilton HM EX, Bermuda


Dear Sirs:


MARVELL TECHNOLOGY GROUP LTD.

We have acted as attorneys in Bermuda for Marvell Technology Group Ltd., a
Bermuda company (the "Company") in connection with its filing with the United
States Securities and Exchange Commission of a Registration Statement on Form
S-8 (the "Registration Statement") with respect to 10,000,000 of the Company's
common shares of par value US$0.002 per share to be issued pursuant to the terms
of the Marvell Technology Group Ltd. Amended and Restated 1995 Stock Option Plan
(together, the "Common Shares").

For the purposes of this opinion we have examined and relied upon the documents
listed, and in some cases defined, in the Schedule to this opinion (the
"Documents") together with such other documentation as we have considered
requisite to this opinion.

ASSUMPTIONS

In stating our opinion we have assumed:

(a)      the authenticity, accuracy and completeness of all Documents and other
         documentation examined by us submitted to us as originals and the
         conformity to authentic original documents of all Documents and other
         documentation submitted to us as certified, conformed, notarised or
         photostatic copies;

(b)      the genuineness of all signatures on the Documents;

(c)      that each of the Documents and other such documentation which was
         received by electronic means is complete, intact and in conformity with
         the transmission as sent;

(d)      that there are no provisions of the laws or regulations of any
         jurisdiction other than Bermuda which would have a material effect on
         any of the opinions herein expressed;

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(e)      that all representations and factual statements appearing in the
         Registration Statement, the Plans and the Resolutions, other than as to
         the laws of Bermuda, are true, accurate and complete in all material
         respects;

(f)      that the Resolutions are in full force and effect and have not been
         rescinded, either in whole or in part, and accurately record: (i) the
         resolutions passed by the Board of Directors and Members of the Company
         in meetings which were duly convened and at which a duly constituted
         quorum was present and voting throughout (ii) resolutions adopted by
         all the Directors of the Company as unanimous written resolutions of
         the Board of Directors and (iii) resolutions adopted by all the Members
         of the Company as unanimous written resolutions of the Members of the
         Company; and further that there is no matter affecting the authority of
         the Directors to bring about the issue of the Common Shares by the
         Company under the terms of the Plans, not disclosed by the
         Constitutional Documents or the Resolutions, which would have any
         adverse implication in relation to the opinions expressed herein;

(g)      that any awards granted under the Plans relevant to this opinion
         (collectively, "Awards") will constitute the legal, valid and binding
         obligations of the parties thereto, other than the Company;

(h)      that each Director of the Company, when the Board of Directors of the
         Company passed the Board Resolutions, discharged his fiduciary duty
         owed to the Company and acted honestly and in good faith with a view to
         the best interests of the Company;

(i)      that the Company has entered into its obligations under the Plans in
         good faith for the purpose of carrying on its business and that, at the
         time it did so, there were reasonable grounds for believing that the
         transactions contemplated in the respective Plan would benefit the
         Company;

(j)      that at the time of issue by the Stock Option Committee of the Board of
         Directors (the "Committee") of any Award, or any Common Shares pursuant
         to any such Award, such Committee was duly constituted and at the date
         hereof remains a duly constituted committee of the Board of Directors
         of the Company having the necessary powers and authorities to issue
         Awards and Common Shares pursuant to the Plans;

(k)      that the approval of the issue of any Awards and of any Common Shares
         under Awards will be duly made either at a duly convened and quorate
         meeting of the Board of Directors of the Company, or at a duly convened
         and quorate meeting of the Committee in a manner complying with the
         terms of the Bye-laws of the Company then in force and within the
         authority then given to the Committee by the Board of Directors of the
         Company;

Marvell Technology Group Ltd.           - 3 -                     27 August 2003

(l)      that when the issue of any Common Shares under the Plans is authorised,
         the issue price will not be less than the par value of the Shares and
         that the Company will have sufficient authorised share capital to
         effect such issue and will continue to hold the necessary Consent from
         the Bermuda Monetary Authority for such share issue;

(m)      that in any case where Common Shares are issued by the Company pursuant
         to the Plans on the terms of an Award that does not require the
         allottee to pay to the Company a cash subscription price for such
         Common Shares, the Company will receive prior to the allotment of
         shares a transfer to it of assets from the allottee with a fair value
         at least equivalent to the aggregate par value of the Shares issued to
         him pursuant to that Award;

(n)      that when filed with the Securities and Exchange Commission, the
         Registration Statement will not differ in any material respect from the
         draft referred to in paragraph 1 of the Schedule;

(o)      that the records which were the subject of the Company Search were
         complete and accurate at the time of such search and disclosed all
         information which is material for the purposes of this opinion and such
         information has not since the date of the Company Search been
         materially altered; and

(p)      that the records which were the subject of the Litigation Search were
         complete and accurate at the time of such search and disclosed all
         information which is material for the purposes of this opinion and such
         information has not since the date of the Litigation Search been
         materially altered.

OPINION

Based upon and subject to the foregoing and subject to the reservations set out
below and to any matters not disclosed to us, we are of the opinion that when
issued and allotted by the Board of Directors of the Company or by the Committee
pursuant to Awards and when fully paid for pursuant to and in accordance with
the terms and conditions of the Plans, as contemplated by the Plans, the Common
Shares will be validly issued, fully-paid and non-assessable shares in the
capital of the Company.

RESERVATIONS

We have the following reservations:

(a)      We express no opinion as to any law other than Bermuda law and none of
         the opinions expressed herein relates to compliance with or matters
         governed by the laws of any jurisdiction except Bermuda. This opinion
         is limited to Bermuda law as applied by the courts of Bermuda at the
         date hereof.

Marvell Technology Group Ltd.           - 4 -                     27 August 2003



(b)      Any reference in this opinion to Common Shares being "non-assessable"
         shall mean, in relation to fully paid shares of the Company and subject
         to any contrary provision in any agreement in writing between the
         Company and the holder of such Common Shares, that no shareholder shall
         be bound by an alteration to the Memorandum of Association or Bye-laws
         of the Company after the date on which he became a shareholder, if and
         so far as the alteration requires him to take, or subscribe for
         additional shares, or in any way increases his liability to contribute
         to the share capital of, or otherwise to pay money to, the Company.

(c)      Searches of the Register of Companies at the office of the Registrar of
         Companies are not conclusive and it should be noted that the Register
         of Companies does not reveal:

         (i)      details of matters which have been lodged for filing or
                  registration which as a matter of general practice of the
                  Registrar of Companies would have or should have been
                  disclosed on the public file but have not actually been
                  registered or to the extent that they have been registered
                  have not been disclosed or do not appear in the public records
                  at the date and time the search is concluded; or

         (ii)     details of matters which should have been lodged for
                  registration but have not been lodged for registration at the
                  date the search is concluded.

(d)      In order to issue this opinion we have carried out the Searches as
         referred to in paragraphs 4 and 5 of the Schedule and have not enquired
         as to whether there has been any change since the date of the Searches.

(e)      We have relied upon the statements made in the Officers Certificate
         referred to in paragraph 9 of the Schedule. We have made no independent
         verification of the matters referred to in the certificate and we
         qualify this opinion to the extent that the statements made in the
         certificate are not accurate in any respect.

DISCLOSURE

This opinion is addressed to you in connection with the registration of the
Common Shares with the Securities and Exchange Commission. Further, this opinion
speaks as of its date and is strictly limited to the matters stated herein and
we assume no obligation to review or update this opinion if applicable law or
the existing facts or circumstances should change. We hereby consent to the
inclusion of the opinion as an exhibit to the Registration Statement.

Marvell Technology Group Ltd.           - 5 -                     27 August 2003

This opinion is governed by and is to be construed in accordance with Bermuda
law. It is given on the basis that it will not give rise to any legal
proceedings with respect thereto in any jurisdiction other than Bermuda.

Yours faithfully
APPLEBY SPURLING & KEMPE





Marvell Technology Group Ltd.                                     27 August 2003

                                    SCHEDULE

1.       An electronic copy of the draft of the Registration Statement received
         on 21 August 2003 (excluding the exhibits and excluding the documents
         incorporated by reference).

2.       An electronic copy of the Marvell Technology Group Ltd. Amended and
         Restated 1995 Stock Option Plan (as amended through 7 May 2001) ( the
         "Plan").

3.       Copies of the Written Resolution of the Board of Directors of the
         Company effective on 18 April 1995, the Minutes of the meeting of the
         Board of Directors of the Company held on 8 May 2000, the Written
         Resolution of the Board of Directors of the Company effective on 8
         February 2001, the Minutes of the meeting of the Board of Directors of
         the Company held on 6 May 2001, the Written Resolution of the Board of
         Directors of the Company effective on 1 May 2003, the Written
         Resolution of the Board of Directors of the Company effective on 7 May
         2003 (the "Board Resolutions"), the Written Resolution of the Members
         of the Company effective 11 April 1995, the Minutes of the meeting of
         the Members of the Company held on 17 June 2000, the Minutes of the
         meeting of the Members of the Company held on 21 June 2001 and the
         Minutes of the meeting of the Members of the Company held on 27 June
         2003 (the "Members Resolutions" and together with the Board Resolutions
         are herein referred to as the "Resolutions")

4.       The entries and filings shown in respect of the Company on the file of
         the Company maintained in the Register of Companies at the office of
         the Registrar of Companies in Hamilton, Bermuda, as revealed by a
         search done on 27 August 2003 (the "Company Search");

5.       The entries and filings shown in respect of the Company in the Supreme
         Court Causes Book maintained at the Registry of the Supreme Court in
         Hamilton, Bermuda, as revealed by a search done on 27 August 2003 (the
         "Litigation Search");

         (The Company Search and the Litigation Search are collectively referred
         to as the "Searches")

6.       Copies of the Certificate of Incorporation, Memorandum of Association
         and Bye-laws of the Company incorporating all amendments to 21 June
         2001 (collectively referred to as the "Constitutional Documents");

7.       A copy of the permissions dated 31 May 2000 given by the Bermuda
         Monetary Authority under the Exchange Control Act (1972) and related
         regulations for the issue of shares in the capital of the Company;